test: add wait for endpoints to be ready in policy enforcement
test: add wait for endpoints to be ready in policy enforcement

Endpoints may not be ready after the container is created, and
as such their policy enforcement fields may not be updated yet
as well. To reduce the possibility of flakes in the CI, wait
for all endpoints to be ready before checking the enforcement
status for ingress and egress of running endpoints in the
policy enforcement Ginkgo test.

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

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