Add CI testing of network restrictions

[mjnagel]

Is your feature request related to a problem? Please describe.

Currently the operator generates network policies based on the Package CR spec (network.allow). These are not currently validated in CI (e2e) to confirm that they are properly restricting ingress/egress.

Describe the solution you'd like

Add testing of network restrictions to e2e test suite covering:

• ingress restictions
• egress restrictions
• allowed and denied networking

Additional context

As we move to istio ambient we will be changing the mechanism for network traffic restrictions and would like to have confidence that the new method of restricting traffic is working 1:1 with the current network policies.

[mjnagel]

May be useful to leverage the existing test package for building this out.