Create Prometheus Rule Resources for Istio Controlplane and Operator Specific Issues

Similar to related issue below, within the monitoring package we will need to populate more PrometheusRule resources for istio metrics that would be relevant for cluster administrators, some examples are:

• istio agent/pilot serving multiple HTTP/500s
• istio_agent_pilot_endpoint_not_ready = 1 for any workload/pod
• istio_agent_pilot_conflict_inbound_listener = 1 for any workload/pod

These should be set to severity=critical within the template.