feat(jans-shibboleth-idp): migrate and modernize health endpoint

- Replace the custom Health Check Servlet with an extension of the standard `/idp/status` endpoint.
- Inject custom status suppliers that report Persistence connection health as before alongside other status suppliers.

Locate the custom Health Check Servlet and the standard /idp/status endpoint in the jans-shibboleth-idp component. Trace how status suppliers are registered, then determine how Persistence connection health can be reported alongside the existing suppliers. Done means the custom servlet is replaced and the standard endpoint reports persistence health as before.

Written by the indexing model from the issue text.