Add approval_rules tracking event for approval policies

What does this MR do and why?

This MR adds event tracking for create_approval_rule_from_merge_request_approval_policy and check_multiple_approval_actions_for_approval_policy which were part of the old code-path before we started using the read model.

References

Screenshots or screen recordings

Before	After

How to set up and validate locally

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.