Add frontend fixture for `all_releases_query.graphql`

What does this MR do?

Adds a frontend fixture that represents the response of app/assets/javascripts/releases/queries/all_releases.query.graphql.

Context

This is the first frontend fixture generated from a GraphQL query; all our existing (JSON) frontend fixtures are generated from our REST API. Because of this, there are no conventions to follow with regards to file structure or naming.

A future MR will update all release tests to use this fixture instead of the hard-coded GraphQL response in mock_data.js.

The fixture

This new fixture is written to tmp/tests/frontend/fixtures-ee/graphql/releases/queries/all_releases.query.graphql.json and looks like this:

{
  "data": {
    "project": {
      "releases": {
        "nodes": [
          {
            "name": "The first release",
            "tagName": "v1.1",
            "tagPath": "/namespace1/releases-project/-/tags/v1.1",
            "descriptionHtml": "\u003cp data-sourcepos=\"1:1-1:33\" dir=\"auto\"\u003eBest. Release. \u003cstrong\u003eEver.\u003c/strong\u003e \u003cgl-emoji title=\"rocket\" data-name=\"rocket\" data-unicode-version=\"6.0\"\u003e🚀\u003c/gl-emoji\u003e\u003c/p\u003e",
            "releasedAt": "2018-12-10T00:00:00Z",
            "upcomingRelease": true,
            "assets": {
              "count": 6,
              "sources": {
                "nodes": [
                  {
                    "format": "zip",
                    "url": "http://localhost/namespace1/releases-project/-/archive/v1.1/releases-project-v1.1.zip"
                  },
                  {
                    "format": "tar.gz",
                    "url": "http://localhost/namespace1/releases-project/-/archive/v1.1/releases-project-v1.1.tar.gz"
                  },
                  {
                    "format": "tar.bz2",
                    "url": "http://localhost/namespace1/releases-project/-/archive/v1.1/releases-project-v1.1.tar.bz2"
                  },
                  {
                    "format": "tar",
                    "url": "http://localhost/namespace1/releases-project/-/archive/v1.1/releases-project-v1.1.tar"
                  }
                ]
              },
              "links": {
                "nodes": [
                  {
                    "id": "gid://gitlab/Releases::Link/2",
                    "name": "Runbook",
                    "url": "https://example.com/runbook",
                    "directAssetUrl": "http://localhost/namespace1/releases-project/-/releases/v1.1/binaries/awesome-app-1",
                    "linkType": "RUNBOOK",
                    "external": true
                  },
                  {
                    "id": "gid://gitlab/Releases::Link/1",
                    "name": "linux-amd64 binaries",
                    "url": "https://downloads.example.com/bin/gitlab-linux-amd64",
                    "directAssetUrl": "http://localhost/namespace1/releases-project/-/releases/v1.1/binaries/linux-amd64",
                    "linkType": "OTHER",
                    "external": true
                  }
                ]
              }
            },
            "evidences": {
              "nodes": [
                {
                  "filepath": "http://localhost/namespace1/releases-project/-/releases/v1.1/evidences/1.json",
                  "collectedAt": "2020-09-24T02:25:21Z",
                  "sha": "760d6cdfb0879c3ffedec13af470e0f71cf52c6cde4d"
                }
              ]
            },
            "links": {
              "editUrl": "http://localhost/namespace1/releases-project/-/releases/v1.1/edit",
              "issuesUrl": "http://localhost/namespace1/releases-project/-/issues?release_tag=v1.1\u0026scope=all\u0026state=opened",
              "mergeRequestsUrl": "http://localhost/namespace1/releases-project/-/merge_requests?release_tag=v1.1\u0026scope=all\u0026state=opened",
              "selfUrl": "http://localhost/namespace1/releases-project/-/releases/v1.1"
            },
            "commit": {
              "sha": "b83d6e391c22777fca1ed3012fce84f633d7fed0",
              "webUrl": "http://localhost/namespace1/releases-project/-/commit/b83d6e391c22777fca1ed3012fce84f633d7fed0",
              "title": "Merge branch 'branch-merged' into 'master'"
            },
            "author": {
              "webUrl": "http://localhost/user3",
              "avatarUrl": "https://www.gravatar.com/avatar/2c75f98f3ea6cd6ee75cfbdfbb031388?s=80\u0026d=identicon",
              "username": "user3"
            },
            "milestones": {
              "nodes": [
                {
                  "id": "gid://gitlab/Milestone/2",
                  "title": "12.4",
                  "description": null,
                  "webPath": "/namespace1/releases-project/-/milestones/2",
                  "stats": {
                    "totalIssuesCount": 4,
                    "closedIssuesCount": 1
                  }
                },
                {
                  "id": "gid://gitlab/Milestone/1",
                  "title": "12.3",
                  "description": null,
                  "webPath": "/namespace1/releases-project/-/milestones/1",
                  "stats": {
                    "totalIssuesCount": 5,
                    "closedIssuesCount": 3
                  }
                }
              ]
            }
          }
        ],
        "pageInfo": {
          "startCursor": "eyJpZCI6IjEiLCJyZWxlYXNlZF9hdCI6IjIwMTgtMTItMTAgMDA6MDA6MDAuMDAwMDAwMDAwIFVUQyJ9",
          "hasPreviousPage": false,
          "hasNextPage": false,
          "endCursor": "eyJpZCI6IjEiLCJyZWxlYXNlZF9hdCI6IjIwMTgtMTItMTAgMDA6MDA6MDAuMDAwMDAwMDAwIFVUQyJ9"
        }
      }
    }
  }
}