tests: Enables a few Conformance tests for Windows

Some of these tests could not be run previously, especially on Windows
Docker containers. But now, by using Windows Containerd, we can finally
run them:

- HostNetwork=true tests: This can now be enabled on Windows Privileged Containers.
- /etc/hosts related tests: These were not supported because it required single
  file mappings, which is possible in Containerd.
- termination message as non-root user: Requires RunAsUsername, and single file
  mappings.

test/e2e/framework/network/utils.go

@@ -848,6 +848,11 @@ func (config *NetworkingTestConfig) createNetProxyPods(podName string, selector
 		pod := config.createNetShellPodSpec(podName, hostname)
 		pod.ObjectMeta.Labels = selector
 		pod.Spec.HostNetwork = config.EndpointsHostNetwork
+
+		// NOTE(claudiub): In order to use HostNetwork on Windows, we need to use Privileged Containers.
+		if pod.Spec.HostNetwork && framework.NodeOSDistroIs("windows") {
+			e2epod.WithWindowsHostProcess(pod, "")
+		}
 		createdPod := config.createPod(pod)
 		createdPods = append(createdPods, createdPod)
 	}