Restricting protected tags to users/groups
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=7018) </details> <!--IssueSummary end--> ### Problem to solve With https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/14986, the API supports protected tags. GitLab EE additionally supports restricting protected tags to users/groups, which the API doesn't support yet. ### Proposal Add support for restricted protected tags similar to protected branches API as described in https://gitlab.com/gitlab-org/gitlab-ee/blob/master/doc/api/protected_branches.md
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