Added tests for issues related merge request count and status

- Added relative time to the status
- Changed date format for status date

The tooltips contain the status label and date

Updated the markup and styles for related merge requests in
issues page

Remove get_build method for find_by_id

See merge request gitlab-org/gitlab-ce!24271

Add link to sample project for functions

See merge request gitlab-org/gitlab-ce!24323

Fix unexpected exception by failure of finding an actual head pipeline

Closes #56113

See merge request gitlab-org/gitlab-ce!24257

Nullify pool_repository when a project leaves

See merge request gitlab-org/gitlab-ce!24225

Support multiple outputs in Jupyter notebooks

Closes #32588 and #31910

See merge request gitlab-org/gitlab-ce!24263

Fix default visibility_level for new projects

Closes #45779

See merge request gitlab-org/gitlab-ce!24120

Add group milestones in upcoming filter

Closes #53431

See merge request gitlab-org/gitlab-ce!23098

Previously the nullification wasn't done, as the only caller would later
destroy the model all together. In
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/9070 this change
was made. This commit is basically a backport before that MR is merged.

Improves restriction of multiple Kubernetes clusters via API

Closes #56110

See merge request gitlab-org/gitlab-ce!24251

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/31910, https://gitlab.com/gitlab-org/gitlab-ce/issues/32588

Remove `releases_page` feature flag

Closes #56072

See merge request gitlab-org/gitlab-ce!24215

Resolve "Rename project tags to project topics"

Closes #54167

See merge request gitlab-org/gitlab-ce!24219

Add documentation for Release Asset Link API

Closes #56060

See merge request gitlab-org/gitlab-ce!24211

We introduced releases_page feature flag.
Given this feature is deemed stable, we should remove
this flag before 19th.

Initial Serverless Functions detailed view

See merge request gitlab-org/gitlab-ce!23863

Modifies authorize! method to accept a third param, and then use it in
combination with 'add_cluster' policy to appropriately restrict adding
multiple clusters

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/56110

- Rename CSS class
- Fix broken test
- Update project settings docs
- Update general project settings image
- Rename helper methods

Preserve URL fragment across sign-in and sign-up redirects

Closes #32584

See merge request gitlab-org/gitlab-ce!19165

Remove unused button classes `btn-create` and `comment-btn`

See merge request gitlab-org/gitlab-ce!23232

[QA] Retrieve the current user name and email

Closes gitlab-org/quality/staging#25

See merge request gitlab-org/gitlab-ce!24298

Use revision instead of build number for TeamCity query.

See merge request gitlab-org/gitlab-ce!23898

Remove backfill migration for legacy projects

See merge request gitlab-org/gitlab-ce!24299

We've found some problems with the backgroung migration:
BackfillLegacyProjectRepositories

See https://gitlab.com/gitlab-org/gitlab-ce/issues/56061

The migration was disabled to run on production:
https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/5906

So to overcome it's not being run anywhere, just remove it.

Whenever all problems in BackfillLegacyProjectRepositories are fixed
we'll create a new migration (with a different timestamp) to have it
run.

Correctly show rebase state in MR widget

Closes #45942

See merge request gitlab-org/gitlab-ce!24300

Merge branch '54484-anchor-links-to-comments-or-system-notes-can-break-with-discussion-filters' into 'master'

Discussion filters - ensured note links resolves to the right note

Closes #54484

See merge request gitlab-org/gitlab-ce!24228

Signed-off-by: Rémy Coutable <remy@rymai.me>

Add documentation for Error Tracking

Closes #55581

See merge request gitlab-org/gitlab-ce!24275