test/e2e/network: add traffic_policy test for ITP / ETP interoperability

This file verifies an expected pod is used to handle a request with various
combinations of topology hints, ETP, and ITP settings.
An Agnhost netexec DaemonSet is deployed with a NodePort service.

For each configuration combination a pod is deployed to a node in one of the zones.
A series of curl requests to the nodeport and the clusterip are used to verify
external and internal traffic policies are handled properly with and without
topology hints enabled.

This test requires a multizone cluster with at least 3 nodes.