Move user cleanup to firstboot script

ansible/roles/firstboot/files/ansible_payload/roles/users/tasks/main.yml

@@ -5,3 +5,8 @@
     generate_ssh_key: yes
     ssh_key_bits: 2048
     ssh_key_file: .ssh/id_rsa
+- name: Delete 'ubuntu' user
+  ansible.builtin.user:
+    name: ubuntu
+    state: absent
+    remove: yes

ansible/roles/os/tasks/main.yml

@@ -15,6 +15,3 @@
 
 - name: Install ansible
   import_tasks: ansible.yml
-
-- name: Delete temporary users
-  import_tasks: users.yml

ansible/roles/os/tasks/users.yml

@@ -1,5 +0,0 @@
-- name: Delete 'ubuntu' user
-  ansible.builtin.user:
-    name: ubuntu
-    state: absent
-    remove: yes