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/create-vms.yml

@@ -1,11 +1,4 @@
 ---
-
-- name: "Create CI namespace {{ test_name }} for test vms"
-  shell: |-
-    kubectl create namespace {{ test_name }} &&
-      kubectl label namespace {{ test_name }} cijobs=true branch="{{ branch_name_sane }}" pipeline_id="{{ pipeline_id }}"
-  changed_when: false
-
 - name: "Create temp dir /tmp/{{ test_name }} for CI files"
   file:
     path: "/tmp/{{ test_name }}"