[MED-25881] Worker Pod Autoscaler support

[matkam]

Adds to ability to scale revisions using a Worker Pod Autoscaler instead of a Horizontal Pod Autoscaler.

[matkam]

This is working in sandbox:

mkamkar@ObvsMBP227 ~> kctl sandbox-reef -n echo-local get replicaset
NAME   DESIRED   CURRENT   READY   AGE
v01    1         1         1       28m
mkamkar@ObvsMBP227 ~> kctl sandbox-reef -n echo-local get wpa
NAME   AGE
v01    95s

But it does require one more small change to the Worker Pod Autoscaler: practo/k8s-worker-pod-autoscaler@master...Medium:spec-omitempty

[matkam]

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