Automated User Management Functionality
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### Description
User management can be difficult and time consuming for Admins. GitLab should make user management easier via some automation.
### Proposal
One nice feature would be the ability to automatically disable a user account (or delete if desired) if they haven't logged in after X number of days/months.
This would be an effective way of "freeing up" licenses after a quarterly true-up. Plus it would make cleaning up a server a lot easier for Admins.
issue