Automatic merge from submit-queue (batch tested with PRs 59463, 59719, 60181, 58283, 59966). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
kubectl scale: support Unstructured objects
Support `Unstructured` objects with kubectl scale.
So that we can use the scale subresource for custom resources (possible after https://github.com/kubernetes/kubernetes/pull/55168 is merged):
```
➜ cluster/kubectl.sh scale --replicas=5 crontabs/my-new-cron-object
crontab "my-new-cron-object" scaled
```
**Release note**:
```release-note
NONE
```
/cc sttts deads2k p0lyn0mial
d4acd6b997