Propagate labels and taints from NodePool to Nodes

DoD:
Propagate labels and taints from NodePool to Nodes
This could be adhoc or levereage by CAPI https://github.com/kubernetes-sigs/cluster-api/issues/493 https://github.com/kubernetes-sigs/cluster-api/issues/7731

Absolute MVP reqs:

• Enable NodePool API to express intent for a set of labels and taints to be propagated to Nodes.

• NodePools should enforce the label/taint sync on Node creation only
• A set of labels should not be constrained to any opinionated prefix, or any prefix at all.

Next step MVP to include:

• Apply full list of labels on Node creation (same as above)

• If labels list changes in NodePools, sync to all existing Nodes

• If label already exists on a Node, leave it alone and assume the user knows what they're doing

• If label doesn't exist on a Node, apply it

• If there are other labels on a Node not in the NodePool list, leave those alone as well

   FWIW The above could be implemented with server side apply on the Nodes of the set of labels.