This method can be called with an array, or a relation:

1. Arrays always have a limited amount of values, so that's fine.
2. If the relation does not have a limit value applied, then we will load every
   single object in that collection, and prevent N+1 queries for the metadata
   for that. But that's wrong, because we should never call this without an
   explicit limit set. So we raise in that case, and this commit will see which
   specs fail.

The only failing specs here were the issues API specs, and the specs for
IssuableMetadata itself, and both have been addressed.

Multi-file editor fetch log data from a different endpoint

Closes #38360

See merge request gitlab-org/gitlab-ce!15132

Make sure that every job has a stage assigned

Closes #37979

See merge request gitlab-org/gitlab-ce!14724

Resolve "Change default size for GKE cluster creation"

Closes #39649

See merge request gitlab-org/gitlab-ce!15220

Resolve "Fix GKE wording"

Closes #39648

See merge request gitlab-org/gitlab-ce!15204

Merge branch '39791-when-reopening-an-issue-the-mattermost-notification-has-no-context-to-the-issue' into 'master'

Resolve "When reopening an issue the Mattermost Notification has no context to the issue"

Closes #39791

See merge request gitlab-org/gitlab-ce!15218

Merge branch '37442-api-branches-id-repository-branches-is-calling-gitaly-n-1-times-per-request' into 'master'

Fetch the merged branches at once in the `/projects/:id/repository/branches` endpoint

See merge request gitlab-org/gitlab-ce!15215

Support custom attributes on groups and projects

See merge request gitlab-org/gitlab-ce!14593

Add changes_count to the merge requests API

See merge request gitlab-org/gitlab-ce!15178

First iteration of Move Kubernetes from service to Cluster page

See merge request gitlab-org/gitlab-ce!15061

[CE backport] Saved configuration for issue board

See merge request gitlab-org/gitlab-ce!15108

Label priority and Priority sort orders

See merge request gitlab-org/gitlab-ce!15219

Fix GFM reference links for closed milestones

Closes #39850

See merge request gitlab-org/gitlab-ce!15234

Change tags order in refs dropdown

Closes #37336

See merge request gitlab-org/gitlab-ce!15235

Updates CE metrics with updated versions from EE

See merge request gitlab-org/gitlab-ce!15229

Enable multiple queries per Prometheus graph

See merge request gitlab-org/gitlab-ce!15201

fix borderzero lint

See merge request gitlab-org/gitlab-ce!15233

Updates CE metrics with updated versions from EE for supported metrics (EE version includes additional items for EE specific features)

Convert copy_as_gfm into ES module and move to behaviors

See merge request gitlab-org/gitlab-ce!14859

34768 Fix problem with issuable header wrapping when content is too long

Closes #34768

See merge request gitlab-org/gitlab-ce!15192

Fixes 404 error to `Issues assigned to me` and `Issues I've created` when issues are disabled

Closes #20666

See merge request gitlab-org/gitlab-ce!15021

Merge remote-tracking branch 'origin/move-kubernetes-from-service-to-clusters-page-10-2-ver' into 35616-move-gke-form-1st-iteration

Refactor Clusters to be consisted from GcpProvider and KubernetesPlatform

See merge request gitlab-org/gitlab-ce!14879

Add all InfluxDB metrics to prometheus

See merge request gitlab-org/gitlab-ce!13891

Fixup rspec tag misuse

See merge request gitlab-org/gitlab-ce!15227