Merge branch '439062-reconsider-upsert-on-member-creation' into 'master'

Optimize organization_user creation on member creation

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/142600



Merged-by: Manoj M J <mmj@gitlab.com>
Approved-by: Manoj M J <mmj@gitlab.com>
Reviewed-by: Doug Stull <dstull@gitlab.com>
Reviewed-by: Manoj M J <mmj@gitlab.com>
Co-authored-by: Doug Stull <dstull@gitlab.com>