Fix failing MySQL spec due to deadlock condition

Closes #55161

See merge request gitlab-org/gitlab-ce!24378

Ignore Repository::AmbiguousRefError in db/fixtures/development

See merge request gitlab-org/gitlab-ce!24366

Support Ajax endpoints for FeatureFlagsController

See merge request gitlab-org/gitlab-ee!9127

Backporting a change in ee branch

See merge request gitlab-org/gitlab-ce!23559

Resolve "When merging an MR, the squash checkbox isn't always supported"

Closes #52278

See merge request gitlab-org/gitlab-ce!24296

Remove cancel all jobs button in general jobs list view

Closes #34665

See merge request gitlab-org/gitlab-ce!24010

Geo: Don't show external link icon for current node

See merge request gitlab-org/gitlab-ee!9130

Make parseBoolean idempotent

See merge request gitlab-org/gitlab-ce!24365

- Support show, create, update, destroy endpoints
- Add tests

Add changelog

Refactor

fix

Use rails status

`spec/features/uploads/user_uploads_file_to_note_spec.rb` was failing in
master because MySQL detected a deadlock when a DELETE and INSERT for
the same indexed item occurred within a transaction in the `uploads`
table.  Due to InnoDB's next-key locking algorithm
(innodb_locks_unsafe_for_binlog in
https://dev.mysql.com/doc/refman/5.5/en/innodb-parameters.html), InnoDB
sets an exclusive lock for any of the indexed records it encounters, so
the INSERT will fail until the DELETE is committed.

To fix this, we just disable the transaction for MySQL and keep
it for PostgreSQL.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/55161

Uses `project_id` for filtering on the GSD

See merge request gitlab-org/gitlab-ee!9109

Fix broken master due to locale/gitlab.pot

See merge request gitlab-org/gitlab-ee!9160

Example: https://gitlab.com/gitlab-org/gitlab-ee/pipelines/43330494

Clarify cluster integration link is for all Kubernetes

See merge request gitlab-org/gitlab-ce!24364

EE: Clarify cluster integration link is for all Kubernetes

See merge request gitlab-org/gitlab-ee!9159

Refactor the Packages documentation

See merge request gitlab-org/gitlab-ee!9095

Generate searchable JSDoc documentation

See merge request gitlab-org/gitlab-ce!23583

Externalize strings from `/app/views/projects/project_members`

See merge request gitlab-org/gitlab-ce!23227

Externalize strings from `/app/views/projects/project_members`

See merge request gitlab-org/gitlab-ee!8727

Not just GKE

Remove all `$theme-gray-{weight}` variables in favor of `$gray-{weight}`

Closes #56266

See merge request gitlab-org/gitlab-ce!24333

Remove all `$theme-gray-{weight}` variables in favor of `$gray-{weight}`

See merge request gitlab-org/gitlab-ee!9133

Fix broken master due to locale/gitlab.pot changes

Closes #9194

See merge request gitlab-org/gitlab-ee!9158

Moves shared code into a mixin

See merge request gitlab-org/gitlab-ce!24322