Create a webhook to do extra validation on beta APIs

[msau42]

/assign @yuxiangqian

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
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Send feedback to sig-testing, kubernetes/test-infra and/or fejta.
/lifecycle stale

[xing-yang]

/remove-lifecycle stale

[humblec]

@yuxiangqian are you on this ?

[yuxiangqian]

@humblec yep, I have it on my plate. thanks.

[yuxiangqian]

/cc @AndiLi99

[yuxiangqian]

Update:
A design doc to introduce webhook is under written. review session will be scheduled soon once done.