CI: remove deletion tasks of 'packet' VMs

Kubevirt VMs deletion will be handled by the Kubernetes GC (see previous
commit), remove all the codes handling that.

tests/cloud_playbooks/roles/packet-ci/tasks/main.yml

@@ -2,16 +2,5 @@
 
 - name: "Include custom vars for ci job: {{ ci_job_name }}"
   include_vars: "../files/{{ ci_job_name }}.yml"
-
-- name: Cleamup old VMs
-  import_tasks: cleanup-old-vms.yml
-
 - name: Create VMs
   import_tasks: create-vms.yml
-  when:
-    - not vm_cleanup
-
-- name: Delete VMs
-  import_tasks: delete-vms.yml
-  when:
-    - vm_cleanup | default(false)