NetworkPolicy to facilitate Defenders to Console WebSocket comms

Adding Network Policy template specifically for Defenders, so they can report in and communicate with the Console. With defaults to talk to all common k8s related private network ranges.

Adding networkPolicies.nodeCidr value with comments so someone can explicitly set their CIDR range of their kubernetes nodes.

Relates to https://repo1.dso.mil/platform-one/big-bang/bigbang/-/issues/721