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.

.gitlab-ci/packet.yml

@@ -65,14 +65,6 @@
   allow_failure: true
   extends: .packet
 
-packet_cleanup_old:
-  stage: deploy-part1
-  extends: .packet_periodic
-  script:
-    - cd tests
-    - make cleanup-packet
-  after_script: []
-
 # The ubuntu20-calico-all-in-one jobs are meant as early stages to prevent running the full CI if something is horribly broken
 packet_ubuntu20-calico-all-in-one:
   stage: deploy-part1