Audit group push rules

What does this MR do and why?

• Adds auditing capability for group push rules.

How to set up and validate locally

• Create a group.
• Open the group push rules from the sidebar.
• Make changes to the push rules for the group.
• Check the audit events for the group, ensure that the logged events are correct.

## Screenshots

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.