Just some extra Matrix room creation logging

See merge request !2356

Resolve conflict where Matrix room exists with alias but we don't have it stored yet

See merge request !2357

(consistency problem)

This solves another class of problems we are seeing with the Gitter -> Matrix import process:

```
Error occurred while backfilling events for opts.uri=undefined gitterRoomId=xxx: matrix-appservice-bridge/matrix-bot-sdk threw an error that looked more like a request object, see {"statusCode":400,"body":{"errcode":"M_ROOM_IN_USE","error":"Room alias already taken"},"headers":{"date":"Fri, 20 Jan 2023 07:55:14 GMT","content-type":"application/json","transfer-encoding":"chunked","connection":"close","cache-control":"no-cache, no-store, must-revalidate","access-control-allow-origin":"*","access-control-allow-methods":"GET, HEAD, POST, PUT, DELETE, OPTIONS","access-control-allow-headers":"X-Requested-With, Content-Type, Authorization, Date","strict-transport-security":"max-age=15724800; includeSubDomains"},"request":{"uri":{"protocol":"https:","slashes":true,"auth":null,"host":"gitter.ems.host","port":443,"hostname":"gitter.ems.host","hash":null,"search":null,"query":null,"pathname":"/_matrix/client/r0/createRoom","path":"/_matrix/client/r0/createRoom","href":"https://gitter.ems.host/_matrix/client/r0/createRoom"},"method":"POST","headers":{"Authorization":"<redacted>","Content-Type":"application/json","content-length":117}}}
```

Follow-up to !2313

Part of #2609

21.56.3

Previous MR where we added `/.well-known/matrix/server`: !2031

Part of https://github.com/matrix-org/matrix-ansible-private/issues/6361
and the Gitter sunset: https://github.com/vector-im/roadmap/issues/26

Add `/.well-known/matrix/client` for Matrix clients

See merge request !2336

Previous MR where we added `/.well-known/matrix/server`: !2031

Part of https://github.com/matrix-org/matrix-ansible-private/issues/6361
and the Gitter sunset: https://github.com/vector-im/roadmap/issues/26

Persist room ID's that failed to import along the way so we can review

See merge request !2354

Before we would only persist all the failures at the end but that means we
can't debug anything while it's still running. And even if we can see the
shell terminal output for the running import process, sometimes it
disconnects and we lose the insight.

Follow-up to !2313

Part of #2609

Matrix bridge doesn't need to have exclusive control over the namespaces in a self-service world

See merge request !2335

As part of the [sunset plan for Gitter](https://github.com/vector-im/roadmap/issues/26), we need to make the
appservice not be exclusive over the namespaces defined in the appservice
registration file so people don't run into errors when they self-service and try to create things.

Part of https://github.com/matrix-org/matrix-hosted/issues/6979

Fix Matrix import process not working with usernames that contain tildes (~)

See merge request !2353

Example: `removed~foobar`

Follow-up to
!2333
!2313

Part of #2609

Better log out the requests that matrix-appservice-bridge/matrix-bot-sdk throws out as errors

See merge request !2352

We're only worrying about improving because that's where we drill down and investigate from more easily than the giant output from an import worker.


Follow-up to !2313

Part of #2609


### Before in `scripts/utils/gitter-to-matrix-historical-import-one-room.js`

Before in `scripts/utils/gitter-to-matrix-historical-import-one-room.js` (yes, it doesn't print the error because it doesn't have an `err.stack` like errors should):

```
2023-01-18T09:30:06.468Z - error: Error occurred while backfilling events for opts.uri=undefined gitterRoomId=xxx:
```

### Before in `scripts/utils/gitter-to-matrix-historical-import-worker.js`

Before in `scripts/utils/gitter-to-matrix-historical-import-worker.js` it printed a garbled mess with no indication which request or URL failed.

```
2023-01-17T20:26:19.683Z - error: concurrentQueue: Failed to process itemId=xxx_eventsCount=4, httpVersionMajor=1, httpVersionMinor=1, httpVersion=1.1, complete=true, rawHeaders=Date,Tue, 17 Jan 2023 20:26:19 GMT,Content-Type,application/json,Transfer-Encoding,chunked,Connection,close,Cache-Control,no-cache, no-store, must-revalidate,Access-Control-Allow-Origin,*,Access-Control-Allow-Methods,GET, HEAD, POST, PUT, DELETE, OPTIONS,Access-Control-Allow-Headers,X-Requested-With, Content-Type, Authorization, Date,Strict-Transport-Security,max-age=15724800; includeSubDomains, rawTrailers=, aborted=false, upgrade=false, url=, method=null, statusCode=400, statusMessage=Bad Request, _consuming=true, _dumped=false, toJSON=function responseToJSON () {
  var self = this
  return {
    statusCode: self.statusCode,
    body: self.body,
    headers: self.headers,
    request: requestToJSON.call(self.request)
  }
}
```

### After in `scripts/utils/gitter-to-matrix-historical-import-one-room.js`

Now we actually get the request URL and details of the response:

```
2023-01-18T09:44:24.581Z - error: Error occurred while backfilling events for opts.uri=undefined gitterRoomId=xxx: matrix-appservice-bridge/matrix-bot-sdk threw an error that looked more like a request object, see {"statusCode":400,"body":{"errcode":"M_ROOM_IN_USE","error":"Room alias already taken"},"headers":{"date":"Wed, 18 Jan 2023 09:44:24 GMT","content-type":"application/json","transfer-encoding":"chunked","connection":"close","cache-control":"no-cache, no-store, must-revalidate","access-control-allow-origin":"*","access-control-allow-methods":"GET, HEAD, POST, PUT, DELETE, OPTIONS","access-control-allow-headers":"X-Requested-With, Content-Type, Authorization, Date","strict-transport-security":"max-age=15724800; includeSubDomains"},"request":{"uri":{"protocol":"https:","slashes":true,"auth":null,"host":"gitter.ems.host","port":443,"hostname":"gitter.ems.host","hash":null,"search":null,"query":null,"pathname":"/_matrix/client/r0/createRoom","path":"/_matrix/client/r0/createRoom","href":"https://gitter.ems.host/_matrix/client/r0/createRoom"},"method":"POST","headers":{"Authorization":"<redacted>","Content-Type":"application/json","content-length":127}}}
2023-01-18T09:44:24.583Z - warn: Waiting for this ongoing message send request to finish and bridged information stored...
redis handler failed during shutdown: TypeError: Cannot read property 'activeMasterClient' of undefined
```

21.56.2

As suggested by @dregad, https://gitter.im/gitter/gitter?at=63c7afc5fce37f655ff65000

Update homepage latest news block to point to Matrix migration blog post

See merge request !2350

As suggested by @dregad, https://gitter.im/gitter/gitter?at=63c7afc5fce37f655ff65000

Add a way to manually dump from a specific list of users

See merge request !2349

These are users we need to manually fix up since we found their entries to be messed up,
See #2856 (comment 1243268761)

Follow-up to !2318

Fix typo in logging call preventing our skips from working

See merge request !2348

Follow-up to !2313

Part of #2609

The skips were originally added in:

 - !2345
 - !2344

Fix old ORG_CHANNEL rooms with no `groupId` not importing

See merge request !2346

These should have been picked up and fixed way back when we migrated to `groupId` so we would never run into a room like this but I guess it was never caught. Let's just deal with it.

Follow-up to !2313

Part of #2609


The import script was running into the following error:

```sh
$ matrix__bridge__applicationServicePort=9001 NODE_ENV=prod ./scripts/utils/gitter-to-matrix-historical-import-one-room.js --uri foo/bar
17 Jan 08:33:48 - opening socket: ws://cube.prod.gitter:1080/1.0/event/put
2023-01-17T08:33:49.898Z - info: Setting up Matrix bridge
2023-01-17T08:33:49.915Z - info: Matrix bridge listening on port 9001
2023-01-17T08:33:49.915Z - info: Ensuring profile info is up-to-date for the Matrix bridge user mxid=@gitter-badger:gitter.im
2023-01-17T08:33:50.011Z - info: Starting import script for foo/bar (57580f83c2f0db084a1cca60) --> matrixHistoricalRoomId=!xxx:gitter.im (live matrixRoomId=!xxx:gitter.im)
MatrixHttpClient (REQ-1) { errcode: 'M_USER_IN_USE', error: 'User ID already taken.' }
2023-01-17T08:33:50.245Z - error: Error occurred while backfilling events for opts.uri=foo/bar gitterRoomId=57580f83c2f0db084a1cca60: AssertionError [ERR_ASSERTION]: groupId=undefined unexpectedly does not exist for gitterRoomId=57580f83c2f0db084a1cca60
    at MatrixUtils.ensureCorrectRoomState (./modules/matrix-bridge/lib/matrix-utils.js:367:5)
    at async MatrixUtils.ensureCorrectHistoricalMatrixRoomStateAfterImport (./modules/matrix-bridge/lib/matrix-utils.js:536:7)
    at async gitterToMatrixHistoricalImport (./modules/matrix-bridge/lib/gitter-to-matrix-historical-import.js:616:3)
    at async exec (./scripts/utils/gitter-to-matrix-historical-import-one-room.js:50:3)
2023-01-17T08:33:50.246Z - warn: Waiting for this ongoing message send request to finish and bridged information stored...
redis handler failed during shutdown: TypeError: Cannot read property 'activeMasterClient' of undefined
```


### Testing strategy

```
$ mongo gitter

> db.troupes.insert({
    "githubType" : "ORG",
    "userCount" : 9,
    "security" : null,
    "githubId" : 5990364,
    "uri" : "gitterhq-legacy-test-org-channel",
    "lcOwner" : "gitterhq-legacy-test-org-channel",
    "lcUri" : "gitterhq-legacy-test-org-channel",
    "__v" : 0,
    "sd" : {
        "type" : "GH_ORG",
        "members" : "GH_ORG_MEMBER",
        "admins" : "GH_ORG_MEMBER",
        "public" : false,
        "linkPath" : "gitterhq",
        "externalId" : 5990364
    }
});


> db.troupes.insert({
    "githubType" : "ORG_CHANNEL",
    "lcUri" : "gitterhq-legacy-test-org-channel/no-group-id",
    "userCount" : 0,
    "ownerUserId" : null,
    "parentId" : db.troupes.findOne({ lcUri: "gitterhq-legacy-test-org-channel" })._id,
    "security" : "PUBLIC",
    "uri" : "gitterhq-legacy-test-org-channel/no-group-id",
    "lcOwner" : "gitterhq-legacy-test-org-channel",
    "bans" : [ ],
    "oneToOneUsers" : [ ],
    "providers" : [ ],
    "renamedLcUris" : [ ],
    "status" : "ACTIVE",
    "tags" : [ ],
    "sd" : {
        "type" : "GH_ORG",
        "members" : "INVITE",
        "admins" : "GH_ORG_MEMBER",
        "public" : false,
        "linkPath" : "gitterhq",
        "externalId" : 5990364
    }
});
```

```
matrix__bridge__applicationServicePort=9001 node ./scripts/utils/gitter-to-matrix-historical-import-one-room.js --uri gitterhq-legacy-test-org-channel/no-group-id
```

Add room ID option to import one room script for easier debugging

See merge request !2347