Support automatic project archiving based on certain rules
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### Release notes
GitLab supports the ability to automatically archive projects based on defined rules. This allows administrators to keep their GitLab instance lean.
### Problem to solve
A GitLab instance with many unarchived, inactive projects can have cluttered project lists and search results. This leads to a bad user experience.
### Proposal
GitLab supports a way to configure automatic archiving based on pre-defined rules.
### Intended users
* Instance administrators
issue