Automatic merge from submit-queue (batch tested with PRs 55900, 55995, 55913, 55467, 55376). 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>.

Use structured generator for kubectl autoscale

**What this PR does / why we need it**:

Use structured generator for kubectl autoscale

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
part of  # https://github.com/kubernetes/kubectl/issues/138

**Special notes for your reviewer**:
/assign @mengqiy 

**Release note**:

```release-note
Use structured generator for kubectl autoscale 
```