CI: convert molecule jobs to parallel:matrix

With the new provisionning using kubevirt this should be faster.

tests/cloud_playbooks/roles/packet-ci/templates/vm.yml.j2

@@ -13,7 +13,7 @@ metadata:
     kubevirt.io/os: {{ cloud_image }}
     kubevirt.io/size: small
     ci_job_id: "{{ ci_job_id }}"
-    ci_job_name: "{{ ci_job_name }}"
+    ci_job_name: "{{ lookup('ansible.builtin.env', 'CI_JOB_NAME_SLUG') }}"
   # leverage the Kubernetes GC for resources cleanup
   ownerReferences:
   - apiVersion: v1