playbooks/remove_node.yml: fixes localhost validation task (#12420)

- Add gather_facts: false (no system facts needed for validation)
- Add become: false (no privilege escalation needed on localhost)

playbooks/remove_node.yml

@@ -1,6 +1,8 @@
 ---
 - name: Validate nodes for removal
   hosts: localhost
+  gather_facts: false
+  become: false
   tasks:
     - name: Assert that nodes are specified for removal
       assert: