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Automatic merge from submit-queue StatefulSet scale subresource **What this PR does / why we need it**: This PR implements scale subresource for StatefulSet. **Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #46005 **Special notes for your reviewer**: **Release note**: ```release-note StatefulSet uses scale subresource when scaling in accord with ReplicationController, ReplicaSet, and Deployment implementations. ``` **Feature Checklist**: - [x] Introduce Registry interface for storage purpose - [x] Introduce `ScaleREST New(), Get() and Update()` utility functions - [x] Create a `ScaleREST` object at `NewREST()` and return it - [x] Enable scale subresource by adding `/scale` field to the storage map **Testing Checklist**: - Unit testing - [x] Modify `newStorage()` to call `NewStorage()`, and change all unit tests accordingly - [x] Add unit tests for `ScaleREST Get() and Update()` utility functions - [x] Add missing unit test for `ShortNames` - Manual testing - [x] Verify existence of the subresource using `kubectl proxy` command - [x] Modify the subresource using `curl` via `POST` - e2e testing - [x] Add e2e tests using `RESTClient`