Add option to uninstall Prometheus from managed Kubernetes cluster
We should add the option to remove Prometheus from a managed Kubernetes cluster (that we deployed). This is important for general cleanliness, so we don't expose the option to install something, but don't give you an easy option to remove.
Uninstalling should trigger a
helm delete of the Prometheus deployment, as well as disable integration if that is the last deployed Prometheus server on a cluster.