When deleting a user, confirmation should list affected repositories as part of the user "contributions"
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### Problem to solve
When deleting a user, the affected repositories that may be deleted as a result/side effect should be alerted to the administrator.

### Target audience
System Administrator
### Proposal
A simple bullet-list of of hyperlinked groups and/or repositories would be great, the admin should have visibility on any destructive change deleting the account may trigger.
### Links / references
~"feature proposal"
issue