Deploy a network policy at runtime on the operator namespace, controlled by CSV env.

E.g. add a "DEPLOY_OPERATOR_NETWORK_POLICY" env to CSV, passed down to the operator, that defaults to true.

When enabled, the operator should create a network policy via its "static controller", for the operator namespace.

Typically, the operator netpol needs egress rules to allow contacting apiserver, and ingress rules for its webhooks and metrics.