Fix error 500 renaming group. Also added specs and changelog.
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/17922 and https://gitlab.com/gitlab-org/gitlab-ce/issues/23223
When there are tags in the container registry, the group removal is not allowed. We should gracefully recover from the error and notify the user.
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Changelog entry added - Tests
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Added for this feature/bug -
All builds are passing
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Conform by the merge request performance guides -
Conform by the style guides -
Branch has no merge conflicts with master
(if it does - rebase it please) -
Squashed related commits together