title: azure devops , restrict permission to add reviewers in PR
body: <p>we have branch the master , I added in branch policy approvers and must 1 to approve.</p>
  <p>and i added 2 names in &quot;Automatically included reviewers&quot;</p>
  <p>now I want to restrict from developers to add approvers and only who is in &quot;Automatically included reviewers&quot; list , can approve.</p>