Automatically enable multiple MR assignees feature flag

See merge request gitlab-org/gitlab-ee!10558

Extract due quick action to shared example

Closes #59570

See merge request gitlab-org/gitlab-ce!26918

Quarantine flaky specs

See merge request gitlab-org/gitlab-ce!27170

Git push options to create a merge request, set target_branch and set merge when pipeline succeeds

Closes #53198 and #43263

See merge request gitlab-org/gitlab-ce!26752

Fix backport of project_creation_level migration

See merge request gitlab-org/gitlab-ce!27167

EE: Fix backport of project_creation_level migration

See merge request gitlab-org/gitlab-ee!10672

Fixes stylelint warnings in environments

Closes #59903

See merge request gitlab-org/gitlab-ce!27131

Related to:

- https://gitlab.com/gitlab-org/gitlab-ce/issues/60270
- https://gitlab.com/gitlab-org/gitlab-ce/issues/60271
- https://gitlab.com/gitlab-org/gitlab-ce/issues/60272
- https://gitlab.com/gitlab-org/gitlab-ce/issues/60273Signed-off-by: Rémy Coutable <remy@rymai.me>

Extract EE specific files/lines for spec/features/merge_request

Closes #6574

See merge request gitlab-org/gitlab-ee!10612

Extracts EE-specific Merge Request feature specs to /ee

This schedules a background migration that checks whether
`multiple_merge_request_assignees` feature flag needs to
be enabled. The rule for it is that
every PopulateMergeRequestAssigneesTable background job
cannot be still running, or being retried or dead.

If there are any enqueued jobs in the state above, the
"checker" (MergeRequestAssigneesMigrationProgressCheck) will
be rescheduled for 3 hours ahead. If there are only dead jobs
in the queue (i.e. no scheduled/enqueued or retrying jobs), we
raise an error and stop the rescheduling.

Docs: Add examples for linking to header IDs

Closes #57191

See merge request gitlab-org/gitlab-ce!26091

Docs: Fix anchors related to issues

See merge request gitlab-org/gitlab-ce!27165

Use US English for content

See merge request gitlab-org/gitlab-ce!27154

Fix code block not rendering

See merge request gitlab-org/gitlab-ce!27153

Deletes unused CSS
Moves prometheus selectors into a prometheus file

Use RECEIVE namespace rather than REQUEST

See merge request gitlab-org/gitlab-ce!27130

Fixed EE differences in noteable_note.vue

Closes gitlab-ee#9972

See merge request gitlab-org/gitlab-ce!27128

Fixed EE differences in noteable_note.vue

Closes #9972

See merge request gitlab-org/gitlab-ee!10646

Resolve "Extract EE specific files/lines for CI/CD spec/requests/api" CE

See merge request gitlab-org/gitlab-ce!27147

CE: Resolve "Extract EE specific files/lines for spec/features/boards"

See merge request gitlab-org/gitlab-ce!27110

Resolve "Extract EE specific files/lines for spec/features/boards"

Closes #6573

See merge request gitlab-org/gitlab-ee!10611

Add methods to check dead and retrying jobs

See merge request gitlab-org/gitlab-ce!27149

Reduce rspec retries

See merge request gitlab-org/gitlab-ce!26934

In both e2e QA tests and unit tests, reduce the number of retires
to 2 (i.e., 1 initial and one retry)

Use Rack::Utils.clean_path_info instead of copy-pasted version.

See merge request gitlab-org/gitlab-ce!27001