Ability to only cordon/drain nodes without creating remediation pods

[ordovicia]

Sometimes we want to only cordon or drain an unhealthy node, but want not to create a pod that performs remediation.
Specifying a "no-op" remediation job in spec.jobTemplate in NodeOperation simulates this behavior, but that still creates a meaningless pod.

This feature will make it easy to transition from draino to node-operation-controller.