Merge branch 'mokhax/412693/root-ancestor' into 'master'

Scope feature flag to root namespace

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/143434



Merged-by: Jarka Košanová <jarka@gitlab.com>
Approved-by: Brian Williams <bwilliams@gitlab.com>
Approved-by: Jarka Košanová <jarka@gitlab.com>
Co-authored-by: mo khan <mo@mokhan.ca>