Use JavaScript tooltips for mentions
What does this MR do?
- use JavaScript tooltips instead of plain title for mentions (issue, merge request, snippet, user, group, commit, commit range, milestone)
Are there points in the code the reviewer needs to double check?
Not really.
Why was this MR needed?
JavaScript tooltips look nicer and can wrap.
What are the relevant issue numbers?
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/5261#note_13106713, fixes #21500 (closed)
Screenshots
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