Revert "chore(CI): update testdata with insecureKubeletReadonlyPortEnabled" (terraform-google-modules#2137)

Author: apeabody

test/integration/private_zonal_with_networking/testdata/TestPrivateZonalWithNetworking.json

@@ -212,9 +212,6 @@
  "diskType": "pd-standard",
  "effectiveCgroupMode": "EFFECTIVE_CGROUP_MODE_V2",
  "imageType": "COS_CONTAINERD",
- "kubeletConfig": {
- "insecureKubeletReadonlyPortEnabled": true
- },
  "labels": {
  "cluster_name": "CLUSTER_NAME",
  "node_pool": "default-node-pool"