In-app awareness of Registration Features
## Summary
In https://gitlab.com/groups/gitlab-org/-/epics/6798+ we introduced an offer of (select) paid features in exchange for enabling Service Ping. This offer is referred to as [Registration Features](https://docs.gitlab.com/ee/development/service_ping/#registration-features-program) and is targeting our free self-managed user base.
This issue is to advertise the offer beyond the admin settings page.
## Proposed Ideas
_The following is applicable to Admin users on Free instances only, message applicable to both CE and EE._
1. [ ] Admin user lands on page where the feature lives and gets pop-up or sees a :question: they can hover over. Message explains "This is a paid feature, but you can use this for free. Click here to learn more." The click takes them to a page explaining the program and allows them to enroll right there. https://gitlab.com/gitlab-org/gitlab/-/issues/341949 (tentatively scheduled for %"14.5")
1. [ ] In-app pop-up to admin users only, every 6 months, which offers Registration features.
epic