Implement build stage_id reference migration clean up

Closes #34893

See merge request !12785

Resolve "Navigation - Add contextual navigation on mobile"

Closes #34036

See merge request !12944

We need to use a spy because an `after` RSpec hook is also going to call
the migration we want to test, so we need to use `have_received`
expectation. See gitlab-org/gitlab-ce#35351 for more details.

Respect blockquote line breaks in markdown

Closes #33770

See merge request !12977

Hide description about protected branches to non-member

Closes #35253

See merge request !12945

Add versions to Prometheus metrics doc

See merge request !12935

24570 use re2 for user supplied regexp 9 3

See merge request !2129

[9.3 security fix] Renders 404 if given project is not readable by the user on Todos dashboard

See merge request !2118

Use uploads/system directory for personal snippets

See merge request !2123

Remove the `appearance` symlink that was previously missed

See merge request !2124

* dev/master:
  Update CHANGELOG.md for 9.0.11
  Update CHANGELOG.md for 9.1.8
  Update CHANGELOG.md for 8.17.7
  Update CHANGELOG.md for 9.2.8
  Update CHANGELOG.md for 9.3.8

Fix date bug in JS that makes dates not work with strings

Closes #29916

See merge request !12147

[ci skip]

[ci skip]

[ci skip]

[ci skip]

[ci skip]

35209 Add wip message to new navigation preference section

Closes #35209

See merge request !12943

Fix a broken spec

Closes #31443

See merge request !12963

Contextual breadcrumb title fixes

Closes #34030 and #34033

See merge request !12602

Fix issue detail if user who last edited an issue was deleted

Closes #34930

See merge request !12933

Add github imported projects count to usage data

Closes #34563

See merge request !12959

Clear issuable count cache on update

Closes #34772

See merge request !12795

Replaces 'dashboard/event_filters.feature' spinach with rspec

See merge request !12651

Replaces dashboard/dashboard.feature spinach with rspec

See merge request !12876

Always return the translated level name.

Closes #35034

See merge request !12852

Remove double new issue button on group issue dashboard empty state

Closes #35211

See merge request !12924

Fix CI Status alignment for artifacts page

Closes #35251

See merge request !12948

Document the original release of each Prometheus metric.

Add Bulgarian translations of Pipeline Schedules

Closes #34998

See merge request !12825

Add Esperanto translations of Pipeline Schedules

Closes #35001

See merge request !12828