Create compliance parent nav items for both admin and user topics

What does this MR do and why?

For: gitlab#448616 (closed), provide a compliance parent navigation item for both admin topics and user topics.

Screenshots, screen recordings, or links to review app

• Before (admin page): https://docs.gitlab.com/ee/administration/compliance.html
• After (admin page): https://eread-create-compliance-parent-nav-items-for-both-admin-and-use.docs.gitlab-review.app/ee/administration/compliance.html
• Before (user page): https://docs.gitlab.com/ee/user/compliance/
• After (user page): https://eread-create-compliance-parent-nav-items-for-both-admin-and-use.docs.gitlab-review.app/ee/user/compliance/

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.