Merge branch 'kenneth-check-owner-account-exists-project-builder-hook' into 'master'

Check if owner account exists

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/140274



Merged-by: Madelein van Niekerk <mvanniekerk@gitlab.com>
Approved-by: Madelein van Niekerk <mvanniekerk@gitlab.com>
Co-authored-by: Jessie Young <jessieyoung@gitlab.com>
Co-authored-by: Kenneth Chu <ksiuhengchu@gitlab.com>