Custom commit message when reverting a merge request from the UI

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Problem to solve

Reverting a merged MR from the UI uses the default git revert message which is not very descriptive. If we revert from master, it will just revert the "merge commit" which isn't too useful. Also, the commit doesn't pass Danger.

Further information

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22134#note_106704547 https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/22134#note_106704802

Proposal

Provide input for a customized commit message in the Revert this merge request dialog

(pre-populate the commit message box with the default This reverts merge request !5)