Merge branch 'remove-specific-cross-fkey-allowances-for-gitlab_sec-schema' into 'master'

chore: Remove allow_cross_foreign_keys for gitlab_sec

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/176726



Merged-by: Prabakaran Murugesan <pmurugesan@gitlab.com>
Approved-by: Prabakaran Murugesan <pmurugesan@gitlab.com>
Co-authored-by: Lucas Charles <lcharles@gitlab.com>