nil-check Repository::is_ancestor?

Closes #33377

See merge request !11976

Resolve "Add extra functionality for the top right Plus Button"

Closes #23603

See merge request !11632

Improve form spec

See merge request !11879

Document using separate tables instead of polymorphic associations and STI

See merge request !11168

33308 Use pre-wrap for commit messages to keep lists indented

Closes #33308

See merge request !11957

Translate project & repository pages

See merge request !11183

Add all pipeline sources as special keywords to 'only' and 'except'

Closes #32955

See merge request !11972

Responsive table button layout fixes

See merge request !11949

Added more actions and report as abuse to all notes

See merge request !11352

Add sticky confidential issue bar

Closes #29741

See merge request !11952

Backport from EE: Fix '/unassign' slash command

See merge request !11926

Fix backup task to continue on corrupt repositories

Closes #31767

See merge request !11962

Sync email address from specified omniauth provider

See merge request !11268

Perform filtered search when state tab is changed

Closes #27261

See merge request !11917

Fix tooltip on pipelines page not updating

Closes #33272

See merge request !11960

Update testing.md `# Frontend Testing` to include integration spec for edge cases

See merge request !11784

Fix memoization in ContributionsCalendar#activity_dates

See merge request !11973

Re-enable Gitaly commit_raw_diffs migration

See merge request !11970

One should really use a separate table instead of using polymorphic
associations.

See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11168 for
more information.

Instead of using polymorphic associations a developer should use
separate tables.