Use sleep instead of wait for large clusters

Author: serathius

tests/e2e/scenarios/scalability/pre-test.sh

@@ -26,5 +26,6 @@ if [[ "${CLOUD_PROVIDER}" == "gce" ]]; then
     --set=spec.maxSize=1 --set=spec.minSize=1 --set=spec.rootVolume.type=hyperdisk-balanced \
     --set=spec.image="${INSTANCE_IMAGE:-ubuntu-os-cloud/ubuntu-2404-noble-amd64-v20251001}"
   kops update cluster --yes
-  kops validate cluster --wait 10m
+  # TODO: Replaced with `kops validate instancegroup --wait 10m` when it's fixed for 5k node clusters.
+  sleep 120 # should take around 2 minutes to get node read
 fi