Merge branch 'jm-zoekt-skip-indexing-during-watermark' into 'master'

Skip initial indexing tasks on indices that exceed storage watermark

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/166360



Merged-by: John Mason <9717668-johnmason@users.noreply.gitlab.com>
Approved-by: Terri Chu <tchu@gitlab.com>
Reviewed-by: Terri Chu <tchu@gitlab.com>
Co-authored-by: John Mason <jmason@gitlab.com>