Assign priority class names to the cluster critical components

[surajssd]

Lokomotive has following priority classes defined by default:

$ kubectl get pc
NAME                      VALUE        GLOBAL-DEFAULT   AGE
system-cluster-critical   2000000000   false            139m
system-node-critical      2000001000   false            139m

Assign these classes to the control plane components apiserver, scheduler, controller-manager (bootstrap and otherwise). Calico, kube-proxy, kubelet, coredns, podcheckpointer, etc.

This assignment will make sure that the essential services are not pre-empted for a lesser priority workloads.