[BUG] ValidatingWebhook is broken for users without cert manager

What happened?

Currently, the Helm chart webhookvalidation relies entirely on the cert-manager annotation to inject the caBundle

If a user manages their own certificates and deploys the chart with certManager.enabled: false, the caBundle field is completely omitted from the webhook's clientConfig, because the Kubernetes API server mandates a caBundle to verify webhook TLS, the webhook configuration is fundamentally broken for anyone not using cert-manager

Steps to Reproduce

Run a dry-run templating of the webhook without cert manager :-

helm template test-release charts/node-readiness-controller \
  --set webhook.enabled=true \
  --set validatingWebhook.enabled=true \
  --set certManager.enabled=false \
  -s templates/validatingwebhookconfiguration.yaml

Observe that the output clientConfig lacks a caBundle field entirely

Expected Behavior

The Helm chart should expose a validatingWebhook.caBundle field in values.yaml and inject it into the clientConfig of the ValidatingWebhookConfiguration template when certManager.enabled is false.

Controller Version / Image Tag

main / chart v0.1.0

Kubernetes Version

Any Kubernetes version 1.25+

Controller Logs

NA

Additional Environment Details

I will open a PR for this fix