Merge branch 'vij-remove-namespace-limits-admin-ff' into 'master'

Removes namespace_limits_admin_dashboard FF

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/126547



Merged-by: Madelein van Niekerk <mvanniekerk@gitlab.com>
Approved-by: Prabakaran Murugesan <pmurugesan@gitlab.com>
Approved-by: Madelein van Niekerk <mvanniekerk@gitlab.com>
Reviewed-by: Kos Palchyk <kpalchyk@gitlab.com>
Co-authored-by: Vijay Hawoldar <vhawoldar@gitlab.com>