[Mics]: add podautoscaler webhook

[googs1025]

Pull Request Description

[Please provide a clear and concise description of your changes here]

• add podautoscaler webhook for validate spec

Related Issues

Resolves: #[Insert issue number(s)]

Important: Before submitting, please complete the description above and review the checklist below.

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• Thorough testing completed, no regressions introduced

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[googs1025]

TODO:

• add integration test