Add zoekt update_replica_states task

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/158100



Merged-by: Ravi Kumar <rkumar@gitlab.com>
Approved-by: Dmitry Gruzd <dgruzd@gitlab.com>
Reviewed-by: Krasimir Angelov <kangelov@gitlab.com>
Reviewed-by: Dmitry Gruzd <dgruzd@gitlab.com>
Reviewed-by: Terri Chu <tchu@gitlab.com>
Co-authored-by: John Mason <jmason@gitlab.com>