CI: cleanup '-scale' tests infra (#11535)

There is actually no test using this since ad6fecefa8,
so there is no reason to keep that infra in our tests scripts.

tests/scripts/testcases_run.sh

@@ -54,7 +54,7 @@ run_playbook () {
 playbook=$1
 shift
 # We can set --limit here and still pass it as supplemental args because `--limit`  is a 'last one wins' option
-ansible-playbook --limit "all:!fake_hosts" \
+ansible-playbook \
      $ANSIBLE_LOG_LEVEL \
     -e @${CI_TEST_SETTING} \
     -e @${CI_TEST_REGISTRY_MIRROR} \
@@ -85,8 +85,8 @@ fi
 
 # Test control plane recovery
 if [ "${RECOVER_CONTROL_PLANE_TEST}" != "false" ]; then
-    run_playbook reset.yml --limit "${RECOVER_CONTROL_PLANE_TEST_GROUPS}:!fake_hosts" -e reset_confirmation=yes
-    run_playbook recover-control-plane.yml -e etcd_retries=10 --limit "etcd:kube_control_plane:!fake_hosts"
+    run_playbook reset.yml --limit "${RECOVER_CONTROL_PLANE_TEST_GROUPS}" -e reset_confirmation=yes
+    run_playbook recover-control-plane.yml -e etcd_retries=10 --limit "etcd:kube_control_plane"
 fi
 
 # Test collection build and install by installing our collection, emptying our repository, adding