Capture init container logs for dumped pods (#20573)
Capture init container logs for dumped pods (#20573)

This would allow us to debug failures like
https://prow.istio.io/view/gcs/istio-prow/logs/integ-pilot-k8s-tests_istio_postsubmit/1253
where the pod fails during init. We only dump on errors, so this won't
negatively impact test time or anything like that
smawson/istio,smawson/istio,smawson/istio,istio/istio,smawson/istio,istio/istio,istio/istio,istio/istio,smawson/istio,smawson/istio,istio/istio