Automatic merge from submit-queue

Rename PetSet to StatefulSet

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**What this PR does / why we need it**: #35534

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, #<issue_number>, ...)` format, will close that issue when PR gets merged)*: 

**Special notes for your reviewer**: cc @erictune @foxish @kubernetes/sig-apps @ymqytw 

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