reboot(role): intro. reboot role, which handles local conns. gracefully

Also use this role instead of plain ansible.builtin.reboot.
This is in preparation for using ansible_pull as we don't want to have
ansible.builtin.reboot fail local playbook runs.

roles/reboot/tasks/main.yaml

@@ -0,0 +1,14 @@
+- name: Reboot
+  ansible.builtin.reboot:
+  become: true
+  when: ansible_connection != "local" or reboot__local_handling == "none"
+
+- name: Touch a reboot required file
+  ansible.builtin.file:
+    path: "{{ reboot__local_handling_file }}"
+    state: touch
+    owner: root
+    group: root
+    mode: "0644"
+  become: true
+  when: ansible_connection == "local" and reboot__local_handling == "file"