Implement audit events when policy violations are resolved in merge requests

Collect an audit event when policy violations are resolved in merge requests:

Verification Steps

• Switch to admin mode and setup audit event streaming
  • Doc: https://docs.gitlab.com/administration/compliance/audit_event_streaming/#add-a-new-http-destination
  • Localhost path: http://gdk.test:3000/admin/audit_logs?tab=streams
  • HTTP Listener: https://pipedream.com/
• Create a project
• Navigate to "Secure => Policies => New policy"
• Create a Merge Request Approval policy
• Create an MR that violates the policy
• Resolve the violation and verify an audit event is recorded in SPP project