This will enable Geo to skip shards that not operational.

Relates to gitlab-org/gitlab-ee#4329

The default 404 handler would return the Content-Type format based on the
given format extension. This would cause the Rails CSRF protection to flag an
error, since the .js extension gets mapped to text/javascript format.

Closes #40771

When searching we would limit the scope of ancestors to load because
the filter would be applied to the ancestors. Instead, we need to load
_all_ ancestors for matching projects.

Resolve "New user is sent back to Register tab after confirming email"

Closes #41206

See merge request gitlab-org/gitlab-ce!16174

Use last_edited_at instead of updated_at for displaying issuable last change

Closes #41247

See merge request gitlab-org/gitlab-ce!16406

When a new user confirm his email the signin tab is correctly shown.

System hooks for Merge Requests

See merge request gitlab-org/gitlab-ce!14387

For issuable models we keep two timestamps:
updated_at which is updated whenever any model attribute is changed,
last_edited_at which is changed when only title or description is
changed.

In UI bellow description we display who and when updated the item. But
last_edited_by (used for 'who') is mistakenly combined with updated_at
(when), last_edited_at should be used instead.

Closes #41247