Replaced the fork form paths with provide/inject

Now that we've fixed the problem of having two workflows, we need to
completely eradicate any hint of there ever being two ways to do this.
The previous changes to the docs left some traces of the two methods,
so I've cleaned up the instructions while keeping the feature flag
historical information. Also removed an old, old image that we don't
need any more.

It's been enabled for a while, so we can remove it
Along with the redundant code

Changelog: changed

Remove prohibit_hexadecimal_branch_names feature flag

See merge request gitlab-org/gitlab!80603

Improve branch defs in repository branch API

See merge request gitlab-org/gitlab!80505

Allow spawning metrics_server instead of forking into it

See merge request gitlab-org/gitlab!80191

This provides better memory use for Puma, and we
will require this for running a non-Ruby server
in the future.

This does not actually start the server for Puma
yet.

Change opened to created

See merge request gitlab-org/gitlab!80378

Fix metric keys changing with switch to Ci connection

See merge request gitlab-org/gitlab!80354

Upgrade to Rails v6.1.4.6

See merge request gitlab-org/gitlab!80579

Add warning notification in settings > monitor page

See merge request gitlab-org/gitlab!80696

Docs for logging visibility and deprecations

See merge request gitlab-org/gitlab!79944

ci: Bump all global cache keys for Debian bullseye

See merge request gitlab-org/gitlab!80656

Roadmap settings - Include subgroup in group milestones

See merge request gitlab-org/gitlab!80685

Doc updates for SAST/SD rule overrides

See merge request gitlab-org/gitlab!80567

Doc updates for SAST & Secret-Detection Custom Rule overrides

Remove dependency scanning variable

See merge request gitlab-org/gitlab!79575

Depreciation of oauth tokens with no expiry

See merge request gitlab-org/gitlab!79178

Fix merge request tabs background leakage

See merge request gitlab-org/gitlab!80612

Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/343197
Changelog: fixed

Improve access token wording for deprecation

See merge request gitlab-org/gitlab!80569

This also updates the Gemfile.lock to contain the rainbow gem,
which was added to Gemfile earlier.

@rails/actioncable and @rails/ujs likely haven't changed, but we
should make the frontend versions consistent with the Rails backend
version.

* Diff: https://github.com/rails/rails/compare/v6.1.4.4...v6.1.4.6

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/352659

Changelog: security

Deprecate legacy Gitaly config methods

See merge request gitlab-org/gitlab!80545

Skip specs for flags that do not work for fully decomposed dbs

See merge request gitlab-org/gitlab!80459

Update rake tasks to have multi-db versions

See merge request gitlab-org/gitlab!80312

Merge branch '352746-quarantine-Create-Design-Management-user-adds-a-design-and-annotates-it' into 'master'

[QUARANTINE] Create Design Management user adds a design and annotates it

See merge request gitlab-org/gitlab!80688

Revert "Proxy webpack dev server in test environment"

See merge request gitlab-org/gitlab!80586

Add wait for feature flag in iterations e2e spec

See merge request gitlab-org/gitlab!79995

Behind `roadmap_settings` feature flag

Categorize deprecations and removals files

See merge request gitlab-org/gitlab!80446

This reverts commit 7afca793.