Merge branch...

Merge branch '433252-asynchronously-create-an-index-to-support-batched-background-migration-to-backfill-finding_id' into 'master' 

Schedule asynchronous index creation to support finding_id backfill

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/138339



Merged-by: Michał Zając <mzajac@gitlab.com>
Approved-by: Prabakaran Murugesan <pmurugesan@gitlab.com>