Add cache health check to status page

[Paul-Bob]

Context

Missconfigured caching at the application level will cause Avo to repeatedly validate licenses by making more requests than expected to the HQ server.

Let's implement a quick diagnostic check on the status page to verify if the caching system is functioning correctly.

[github-actions]

This issue has been marked as stale because there was no activity for the past 15 days.