[DNM] Webhook config reworking#1456
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Remove leader election, secretHandler, ensureWebhookConfiguration, and dynamiclistener dependency. The webhook now reads serving certs from mounted files (/tmp/k8s-webhook-server/serving-certs/) populated by needacert via a projected Secret volume. Cert rotation is handled by re-reading the files on each TLS handshake. WebhookConfiguration ownership has moved to the rancher-webhook Helm chart.
NewErrorChecker initializes with a not-ready error. The old secretHandler.sync() cleared it; with that gone the health endpoint returned 500 permanently. Clear the error after the serving cert is successfully loaded, just before ListenAndServeTLS.
Full ValidatingWebhookConfiguration (31 entries) and MutatingWebhookConfiguration (9 entries) with per-entry failurePolicy preserved. MCM-only entries gated on .Values.mcm.enabled. Service annotated for needacert, deployment mounts cattle-webhook-tls secret at /tmp/k8s-webhook-server/serving-certs.
Replaces the cluster-admin ClusterRoleBinding with a scoped ClusterRole + renamed ClusterRoleBinding (rancher-webhook-binding). Helm will prune the old rancher-webhook CRB on upgrade since roleRef is immutable. Enumerates built-in rke-machine types; custom node drivers will need a chart update to add their machine resource.
ListenAndServeTLS blocks, so clients.Start (which starts informer caches) never ran. Validators that read from caches (cluster lookups, RBAC checks, etc.) silently returned empty results. Move the listener into a goroutine, start clients after, and block on ctx.Done.
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