OCPNODE: cover graceful shutdown KubeletConfig validation

[redhat-chai-bot]

Extends the existing kubelet-config denylist table with all graceful node shutdown fields and their platform-managed feature gates, preserving current hard-rejection behavior. Adds scoped CodeRabbit guidance for kubelet-config changes. No production validation behavior changed. Validation: gofmt and go test ./pkg/controller/kubelet-config; broader make targets were attempted but hit missing gpgme.pc in unrelated builds.

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AI-generated. Review for accuracy.

@jaypoulz requested in Slack thread

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