test: add e2e test for proxy-visibility
test: add e2e test for proxy-visibility

Add a basic Ginkgo test to the K8s test suite which tests the following:

* With no proxy visibility annotation, no traffic is redirected to the proxy.
* Adding the proxy visbility annotation redirects traffic to the proxy.
* Removing the proxy visibility annotation removes the redirect, and traffic is
  not redirected to the proxy.

Signed-off by: Ian Vernon <ian@cilium.io>

cilium/cilium,cilium/cilium,tklauser/cilium,cilium/cilium,michi-covalent/cilium,michi-covalent/cilium,michi-covalent/cilium,tgraf/cilium,cilium-team/cilium,cilium/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,tklauser/cilium,tgraf/cilium,cilium-team/cilium,michi-covalent/cilium,tklauser/cilium,tgraf/cilium,tklauser/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium