acc: invariant test: clusters: use $NODE_TYPE_ID (#4361)

Author: denik

acceptance/bundle/invariant/configs/cluster.yml.tmpl

@@ -6,5 +6,5 @@ resources:
     foo:
       cluster_name: test-cluster-$UNIQUE_NAME
       spark_version: 13.3.x-scala2.12
-      node_type_id: i3.xlarge
+      node_type_id: $NODE_TYPE_ID
       num_workers: 1