No addons installed when Prometheus is not installed

[njtran]

When creating a KIT Control Plane and Data Plane without Prometheus installed, the KIT Controller is unable to install any addons due to reconcile errors for Pod Monitors.

2022-06-21T18:50:47.853Z	ERROR	controller.control-plane	Reconciler error	{"reconciler group": "kit.k8s.sh", "reconciler kind": "ControlPlane", "name": "kit-guest-cluster", "namespace": "kit", "error": "reconciling resource, control plane reconciling, ensuring podmonitor for kit-guest-cluster-apiserver, getting object when creating , name kit-guest-cluster-apiserver, no matches for kind \"PodMonitor\" in version \"monitoring.coreos.com/v1\""}

This results in an unhealthy dataplane as kubeproxy and coredns are never installed

[prateekgogia]

Handle the error here
By checking the error like this and ignoring the error.