Merge branch '428689-policies-negative-requried-approvers' into 'master'

Add validation for approvals required

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/183835



Merged-by: Alexander Turinske <aturinske@gitlab.com>
Approved-by: Alexander Turinske <aturinske@gitlab.com>
Co-authored-by: Artur Fedorov <afedorov@gitlab.com>