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/Makefile

@@ -20,18 +20,7 @@ create-packet: init-packet
 	-e pipeline_id="$(CI_PIPELINE_ID)" \
 	-e inventory_path=$(INVENTORY)
 
-delete-packet:
-	ansible-playbook cloud_playbooks/delete-packet.yml -c local \
-	$(ANSIBLE_LOG_LEVEL) \
-	-e @"files/${CI_JOB_NAME}.yml" \
-	-e test_id=$(TEST_ID) \
-	-e branch="$(CI_COMMIT_BRANCH)" \
-	-e pipeline_id="$(CI_PIPELINE_ID)" \
-	-e inventory_path=$(INVENTORY)
-
-cleanup-packet:
-	ansible-playbook cloud_playbooks/cleanup-packet.yml -c local \
-	$(ANSIBLE_LOG_LEVEL)
+delete-packet: ;
 
 create-vagrant:
 	vagrant up