fix(devscripts): add molecule group in roles/devscript/check_cluster_status/molecule.yml

PR [1] ensured our molecule jobs can use group_vars. During this, adding molecule group to one file was missed. This commit adds that.

[1] openstack-k8s-operators#3333

Author: amartyasinha

roles/devscripts/molecule/check_cluster_status/molecule.yml

@@ -9,6 +9,7 @@ log: true
 platforms:
   - name: instance
     groups:
+      - molecule
       - devscript_molecule
 
 provisioner: