Add new IP address restrictions page to global nav

Add navigation item to global navigation

• Link to the merge request that introduced the new page: gitlab!123743 (merged)
• Give the MR a descriptive title.
• Optional. Link to the review app showing the new page: https://jfarmiloe-nav-update-ip-restrictions.docs.gitlab-review.app/ee/user/admin_area/reporting/ip_addr_restrictions.html