Remove unneeded workaround for removing kubeadm DNS (#10695)

Kubeadm dns phase is correctly skipped.
This was a workaround for kubernetes/kubeadm#1557, which was actually
not a bug ; the correct fix was #4867

roles/kubernetes-apps/ansible/tasks/main.yml

@@ -11,15 +11,6 @@
   delay: 1
   when: inventory_hostname == groups['kube_control_plane'][0]
 
-- name: Kubernetes Apps | Cleanup DNS
-  import_tasks: cleanup_dns.yml
-  when:
-    - inventory_hostname == groups['kube_control_plane'][0]
-  tags:
-    - upgrade
-    - coredns
-    - nodelocaldns
-
 - name: Kubernetes Apps | CoreDNS
   import_tasks: "coredns.yml"
   when: