Merge branch 'sk/432513-remove-validation' into 'master'

Remove namespace validation for policy_scope

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/144491



Merged-by: Sashi Kumar Kumaresan <skumar@gitlab.com>
Approved-by: Grzegorz Bizon <grzegorz@gitlab.com>
Approved-by: Dominic Bauer <dbauer@gitlab.com>
Reviewed-by: Grzegorz Bizon <grzegorz@gitlab.com>