Add Audit event types to global navigation

What does this MR do and why?

Add menu item for new documentation added in: gitlab!126360 (merged).

Screenshots, screen recordings, or links to review app

Review app: https://eread-add-audit-event-types-to-global-navigation.docs.gitlab-review.app/ee/administration/audit_event_streaming/audit_event_types.html

Merge request 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 merge request.