Create column labels for tasks imported from Phabricator
Columns used on issue boards are available in the [`maniphest.search](https://phabricator.inverselink.com/conduit/method/maniphest.search/) like this:
```js
"columns": {
"boards": {
"PHID-PROJ-hihi": {
"columns": [
{
"id": 16,
"phid": "PHID-PCOL-haha",
"name": "Backlog"
}
]
}
}
```
We'd need to add a label for each project `phid` we encounter in the `boards` key, and add a `#{project_label}::#{column_label}` label for each column we encounter nested in it.
We need to cache both the project-labels and column-labels in redis mapped to a GitLab label ID so we can reuse them for subsequent issues
issue