Wait for pod in TestAddToAndRemoveFromMesh (#27192)
Wait for pod in TestAddToAndRemoveFromMesh (#27192)

\#27178 removed some waiting logic. This adds it back, due to test
flakes:
https://prow.istio.io/view/gs/istio-prow/logs/integ-pilot-k8s-tests_istio_postsubmit/3647
istio/istio,istio/istio,istio/istio,istio/istio,istio/istio