Merge branch '437896-cleanup-feature-flag' into 'master'

Cleanup the update_default_organization_users

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/142975



Merged-by: Kerri Miller <kerrizor@kerrizor.com>
Approved-by: Kerri Miller <kerrizor@kerrizor.com>
Approved-by: Adam Hegyi <ahegyi@gitlab.com>
Co-authored-by: Doug Stull <dstull@gitlab.com>