Add readiness/livness probes for notification-controller

[alikhil]

Is your feature request related to a problem?

There is a kyverno with configured policy to enforce readiness/liveness probes for all workloads and triggers problem with notification controller without probes

Related helm chart

argo-cd

Describe the solution you'd like

• add /healthz route handling for notification controller
• add readiness/liveness probes to helm chart

Describe alternatives you've considered

• disable policy / make an exception for notification-controller

Additional context

No response