Only allow strings in URL::Sanitizer.valid?

Closes #55079

See merge request gitlab-org/gitlab-ce!23675

Fix already initialized constant IDENTIFIER warning

See merge request gitlab-org/gitlab-ce!23681

Check for valid refs in CommitController before doing anything

Closes gitaly#1425

See merge request gitlab-org/gitlab-ce!23680

Revert "Merge branch 'bvl-reenable-codeowners' into 'master'"

See merge request gitlab-org/gitlab-ce!23684

Add endpoint to download single artifact by ref

Closes #54626

See merge request gitlab-org/gitlab-ce!23538

This reverts merge request !23381

Populate MR metrics with events table information (migration)

Closes #41587

See merge request gitlab-org/gitlab-ce!23564

Use new reports syntax for SAST in Auto DevOps

See merge request gitlab-org/gitlab-ce!23163

Fixed styling of image comment badges on commits

Closes #54849

See merge request gitlab-org/gitlab-ce!23659

Backport operations_path helper

See merge request gitlab-org/gitlab-ce!23654

/app/spec/uploaders/personal_file_uploader_spec.rb:3: warning: already initialized constant IDENTIFIER
/app/spec/uploaders/namespace_file_uploader_spec.rb:3: warning: previous definition of IDENTIFIER was here

Before a 404 would be rendered only after a request to Gitaly would
return with an InvalidArgument error. Now we check that the ref have a
valid format before sending it to Gitaly. In both cases, a 404 is
returned to the user, but this change prevents Gitaly from generating
error noise in production.

Closes https://gitlab.com/gitlab-org/gitaly/issues/1425

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/55079

CE Backport: Epic issue list and related issue list re-design

See merge request gitlab-org/gitlab-ce!23658

Resolve "Navigating unresolved discussions on Merge Request page"

Closes #51122

See merge request gitlab-org/gitlab-ce!22789

Resolve "Extended user centric tooltips"

Closes #50157

See merge request gitlab-org/gitlab-ce!23231

[CE] Backport SAML unlink changes: UrlBlocker#ascii_only

See merge request gitlab-org/gitlab-ce!23627

Resolve "Utilize new charting library for metrics dashboard"

See merge request gitlab-org/gitlab-ce!23459

Integrate csslab

Closes csslab#1

See merge request gitlab-org/gitlab-ce!23521

Fix for incorrect Correlation-ID key being passed through GRPC metadata

Closes #55054

See merge request gitlab-org/gitlab-ce!23666

Add Kushal to frontend CODEOWNERS

See merge request gitlab-org/gitlab-ce!23664

Fill project_repositories for hashed storage projects

Closes #48527

See merge request gitlab-org/gitlab-ce!23482

Replace the metrics dashboard graph with
GitLab UI's area chart component

Disable docs lint internal_links check

Closes #55038

See merge request gitlab-org/gitlab-ce!23665

Changed frontmatter filtering to support YAML, JSON, TOML, and arbitrary languages

Closes #52007

See merge request gitlab-org/gitlab-ce!23331

This check never worked once the global navigation changes were rolled
out in https://gitlab.com/gitlab-com/gitlab-docs/merge_requests/362. The
global nav will ALWAYS include /ce and /ee links, and the CE and EE
repos will never include documentation for both.  gitlab-docs now
expects the documentation to be in the following directories:

* /tmp/gitlab-docs/ce (CE)
* /tmp/gitlab-docs/ee (EE)
* /tmp/gitlab-docs/omnibus (Omnibus)

The problem is that the CE and EE repos will only include one of the
first two.

Let's disable this check until
https://gitlab.com/gitlab-com/gitlab-docs/issues/305 is resolved.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/55038

Resolve "Hide variables in UI by default"

Closes #20422

See merge request gitlab-org/gitlab-ce!23518