health: for OnDelete statefulsets, include updated replicas in heath message

[glasser]

Since #136 we've had the policy that an OnDelete statefulset is healthy as long as the statefulset spec is updated and the right number of pods are running, even if some of the pods are old and haven't been deleted yet. That's reasonable, but it still can be helpful to be able to see directly in the health message (and eg, in the ArgoCD UI) how many replicas have been updated. This adds that to the message.

[sonarcloud[bot]]

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