Add push rules to audit events
<!--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=8083) </details> <!--IssueSummary end--> As part of audit events, we should log all instance-level changes in the admin panel. We should track additions/changes to push rules on an instance: 1. Restriction toggles 1. Committer restriction 1. Reject unsigned commits 1. Do not allow users to remove git tags with git push 1. Check whether author is a GitLab user 1. Prevent committing secrets to Git 1. Commit message 1. Branch name 1. Commit author email 1. Prohibited file names 1. Max file size
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