Merge branch 'slashmanov/unify-collapse-threads-action' into 'master'

Unify collapse\expand all unresolved threads action

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/136034



Merged-by: Phil Hughes <me@iamphill.com>
Approved-by: Martin Čavoj <mcavoj@gitlab.com>
Approved-by: Phil Hughes <me@iamphill.com>
Approved-by: Matthew Nearents <mnearents@gitlab.com>
Reviewed-by: Phil Hughes <me@iamphill.com>
Reviewed-by: Stanislav Lashmanov <slashmanov@gitlab.com>
Reviewed-by: Martin Čavoj <mcavoj@gitlab.com>
Co-authored-by: Stanislav Lashmanov <slashmanov@gitlab.com>