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.

Fix broken spec/requests/api/projects_spec.rb

See merge request gitlab-org/gitlab!80689

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/79968 removed
`requirements_access_level` from `project_attributes.yml`, and
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/80667 re-added
this attribute to fix to fix a broken FOSS spec.

However, https://gitlab.com/gitlab-org/gitlab/-/merge_requests/80667
broke master because the attribute is used in EE. We now conditionally
add `requirements_access_level` as an expected key in EE and omit this
in FOSS builds.

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/352764

Quarantine Create Design Management user adds a design and annotates it

Pipeline Authoring Issue Implementation template

See merge request gitlab-org/gitlab!80002

When bumping the Debian OS version, we have to be careful that we not
only bump the image but also the cache keys. Let's make it easier to
bump the image and the cache keys by defining a `DEBIAN_VERSION` so we
only have to change one line.

In https://gitlab.com/gitlab-org/gitlab/-/merge_requests/80362 we
bumped the CI images from Debian buster to bullseye. We bumped the
cache key for everything but the QA gems, which appear to be cached in
the `setup-test-env`.

Since Debian bullseye uses libc 2.29 but buster uses 2.28, this led to
errors in the `14-7-stable-ee` branch running C extensions compiled
against the former
(https://gitlab.com/gitlab-org/gitlab/-/jobs/2091504634).

To avoid any potential conflicts between Debian bullseye and buster,
bump all the `v1` cache keys to `v2`.

Make granting of open-source license to public projects configurable

See merge request gitlab-org/gitlab!79855

Update dependency @gitlab/ui to v36

See merge request gitlab-org/gitlab!80054