Observability Configuration Phase 1: Documentation

[david-martin]

Follow on from #1065 , update the guide at https://docs.kuadrant.io/dev/kuadrant-operator/doc/user-guides/full-walkthrough/secure-protect-connect/#optional, and any other locations where Service/PodMonitors are mentioned to reference using this new configuration.
A new guide specifically for enabling Observability, explaining what it does and its intended use would be good to write.