Fix: add cilium remove old resources option

Give users two options: besides skip Cilium, add
`cilium_remove_old_resources`, default is `false`, when set to `true`,
it will remove the content of the old version, but it will cause the
downtime, need to be careful to use.

Signed-off-by: ChengHao Yang <17496418+tico88612@users.noreply.github.com>

roles/network_plugin/cilium/tasks/main.yml

@@ -5,5 +5,10 @@
 - name: Cilium install
   include_tasks: install.yml
 
+# Remove after 2.29 released
+- name: Cilium remove old resources
+  when: cilium_remove_old_resources
+  include_tasks: remove_old_resources.yml
+
 - name: Cilium apply
   include_tasks: apply.yml