Merge branch 'led/remove_unused_helper_methods' into 'master'

Remove methods on NamespacesHelper not being used

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/125413



Merged-by: Mehmet Emin INAC <minac@gitlab.com>
Approved-by: Bishwa Hang Rai <bhrai@gitlab.com>
Approved-by: Mehmet Emin INAC <minac@gitlab.com>
Reviewed-by: Bishwa Hang Rai <bhrai@gitlab.com>
Co-authored-by: Sheldon Led <sheldonled@gitlab.com>