Add new RailsHelpers module for specs

Closes #66688

See merge request gitlab-org/gitlab-ce!32309

Uses spec_helper instead of rails_helper

Closes #66952

See merge request gitlab-org/gitlab-ce!32594

spec/rails_helper.rb was removed on
1068ec2e

Edit to new rules documentation

See merge request gitlab-org/gitlab-ce!32244

Development docs: how to add Prometheus metrics

See merge request gitlab-org/gitlab-ce!32306

This documents the various knowledge needed to add new GitLab
self-monitoring Prometheus metrics.

Updated Feature flags doc

See merge request gitlab-org/gitlab-ce!32578

Fixes two bugs with the `package-and-qa-manual:master` and `build-qa-image` jobs

See merge request gitlab-org/gitlab-ce!32584

Improve output for yarn integrity check

See merge request gitlab-org/gitlab-ce!32569

Fix wording on milestone due date today

Closes #62591

See merge request gitlab-org/gitlab-ce!32096

Remove spec/rails_helper.rb

Closes #66741

See merge request gitlab-org/gitlab-ce!32380

Improve GC_REPORT_BUCKETS granularity

See merge request gitlab-org/gitlab-ce!32586

Remove outdated mail_room check

See merge request gitlab-org/gitlab-ce!32588

Clarify limits for needs keyword

See merge request gitlab-org/gitlab-ce!32444

Preload routes information in Routable

See merge request gitlab-org/gitlab-ce!32352

Backport documentation for status checking behaviors

See merge request gitlab-org/gitlab-ce!32184

Creates utility parser for the job log

See merge request gitlab-org/gitlab-ce!32555

Make unmocked requests fail in Jest again

See merge request gitlab-org/gitlab-ce!31863

Fix wording on milestone due date, to show today instead of
hours ago or remaining, when milestone is due today.

Signed-off-by: Rémy Coutable <remy@rymai.me>

Remove Users.support_bot column

See merge request gitlab-org/gitlab-ce!32554

Backport documentation from
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/15580

Add #environments_cluster_path which will always return nil in CE

See merge request gitlab-org/gitlab-ce!32527

Make sure 'build-qa-image' is created for all pipelines

See merge request gitlab-org/gitlab-ce!32570

This fixes a high frequency N+1 issue:

`RoutableActions#find_routable!` is used across many controllers to
retrieve e.g. the Project or Namespace by path. The `#find_routable!`
method calls `#ensure_canonical_path` which in turn retrieves
`#full_path` from the given Routable.

This in turn triggers a lookup on `routes`, leading to a high frequency
of these queries:

```sql
SELECT  "routes".* FROM "routes" WHERE "routes"."source_id" = $1 AND
"routes"."source_type" = $2 LIMIT $3
```

This is unnecessary as we already join `routes` in
`Routable#find_by_full_path` anyways.

Fix cycle analytics seed script

See merge request gitlab-org/gitlab-ce!32536

Quarantine flaky dashboard_spec.js

See merge request gitlab-org/gitlab-ce!32574

"Allow milestones to be associated with releases" BE

See merge request gitlab-org/gitlab-ce!30816

Modified schema via migrations.
Added one-to-one relationship between the two models.
Added changelog file

Add not null constraints to prometheus_metrics table columns

Closes #66663

See merge request gitlab-org/gitlab-ce!32339

Use new location for helm charts repo

See merge request gitlab-org/gitlab-ce!32563

Expose `name` and `merge_request_event_type` in serialized json and predefined variables

See merge request gitlab-org/gitlab-ce!32323

Skip set_repo_refs to speed up the tests

See merge request gitlab-org/gitlab-ce!32556