Support automatic project archiving based on certain rules
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=417194) </details> <!--IssueSummary end--> ### 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
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