Cleanup prometheus route

The prometheus Route object allows external access to various prometheus resources. The prometheus-proxy containers (an oauth-proxy instance) ensures auth[n,z] for this access.

In https://issues.redhat.com/browse/MON-1631 we want to remove the UI access via this route. We evaluate which resources need to be accessible via this route and remove all non-essential resources by adding a path argument to the route Object. If we need access to multiple resources, additional routes need to be created.