Merge branch 'schmil-post-create-index_vulnerability_occurrences_prim_iden_id_and_vuln_id' into 'master' 

Create index synchronously with primary_identifier_id, vulnerability_id

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/156266



Merged-by: Gregory Havenga <11164960-ghavenga@users.noreply.gitlab.com>
Approved-by: Gregory Havenga <11164960-ghavenga@users.noreply.gitlab.com>
Co-authored-by: Mehmet Emin INAC <minac@gitlab.com>
Co-authored-by: Schmil Monderer <smonderer@gitlab.com>