Automatic merge from submit-queue (batch tested with PRs 52339, 52343, 52125, 52360, 52301)

Make log-dump use 'gcloud ssh' for GKE also

Fixes https://github.com/kubernetes/test-infra/issues/4323

I tested it locally (with some hacking for mimicking gke's DumpClusterLogs function in kubetest) and it worked.

cc @ericchiang