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Never let cluster-scoped resources skip webhooks

Fix #57964

This allows user write webhooks for cluster-scoped custom resources.

We still need to figure out how to selectively exempt cluster-scoped resources from webhooks to avoid bootstrapping deadlocks. For now, if a deadlock occurs, users can work around by first deleting the webhook configuration, then rebooting the webhook, then re-enabling the webhook configuration.

```release-note
Bug fix: webhooks now do not skip cluster-scoped resources

Action required: Before upgrading your Kubernetes clusters, double check if you had configured webhooks for cluster-scoped objects (e.g., nodes, persistentVolume), these webhooks will start to take effect. Delete/modify the configs if that's not desirable.
```