Automatic merge from submit-queue
Switch gcloud compute copy-files to scp
gcloud is deprecating `gcloud compute copy-files` and switching to `gcloud compute scp`. Make the change before things start to break.
https://cloud.google.com/sdk/gcloud/reference/compute/copy-files
Warnings we get: `W0529 10:28:59.097] WARNING: `gcloud compute copy-files` is deprecated. Please use `gcloud compute scp` instead. Note that `gcloud compute scp` does not have recursive copy on by default. To turn on recursion, use the `--recurse` flag.`
/cc @jlowdermilk