Add feature gate for APIServingWithRoutine in v1.30

[tengqm]

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[sftim]

Again, LGTM for docs

[drewhagen]

• Searched for APIServingWithRoutine in Kubernetes code base
• Tracked to this code PR.
• This was implemented for https://github.com/kubernetes/kubernetes/issues/120901.

cc: @linxiulei @kubernetes/sig-api-machinery-misc

We have a LGTM from Docs - can we please get a technical review of this feature gate doc? If any details need adding for optimal clarity of this for our users, please let us know. We appreciate it, thanks!

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