Merge pull request #51471 from ixdy/gcloud-compute-managed-list

Automatic merge from submit-queue (batch tested with PRs 51471, 50561, 50435, 51473, 51436)

Fix `gcloud compute instance-groups managed list` call

**What this PR does / why we need it**: gcloud 168.0.0 makes the `gcloud compute instance-groups managed list --format='value(instanceGroup)'` call return a URL instead of just the name, which is causing `list-instances` to fail. Switching to `--format='value(name)'` seems to restore the old behavior.

x-ref #49673 

**Release note**:

```release-note
NONE
```

/cc @wojtek-t @mwielgus @shyamjvs @jiayingz @mindprince

cluster/gce/util.sh

@@ -336,7 +336,7 @@ function detect-node-names() {
   INSTANCE_GROUPS+=($(gcloud compute instance-groups managed list \
     --zones "${ZONE}" --project "${PROJECT}" \
     --regexp "${NODE_INSTANCE_PREFIX}-.+" \
-    --format='value(instanceGroup)' || true))
+    --format='value(name)' || true))
   NODE_NAMES=()
   if [[ -n "${INSTANCE_GROUPS[@]:-}" ]]; then
     for group in "${INSTANCE_GROUPS[@]}"; do