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Add UT for pkg/kubectl/autoscale_test.go
**What this PR does / why we need it**:
I find there is no UT for testing pkg/kubectl `HorizontalPodAutoscalerV1.generate(params)`. This PR add some UTs in pkg/kubectl/autoscale_test.go
**Which issue this PR fixes** : fixes#50810
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
/sig cli