ansible-pull(role): have failure notify deploy match other script deploy

Have the deployment of the ansible-pull-failure-notify script match the
deployment of the other helper scripts.

roles/ansible_pull/tasks/main.yaml

@@ -36,14 +36,16 @@
     - ansible-pull-successful-run-timestamp-exporter
     - ansible-pull-reboot
 
-- name: ensure ansible-pull-failure-notify script installation exists
+- name: ensure templated helper script installations exists
   ansible.builtin.template:
-    src: ansible-pull-failure-notify.sh.j2
-    dest: /usr/local/sbin/ansible-pull-failure-notify.sh
+    src: "{{ item }}.sh.j2"
+    dest: "/usr/local/sbin/{{ item }}"
     owner: root
     group: root
     mode: "0755"
   become: true
+  loop:
+    - ansible-pull-failure-notify
 
 - name: ensure secrets directory exists
   ansible.builtin.file:

roles/ansible_pull/templates/ansible-pull-failure-notify.service.j2

@@ -3,5 +3,5 @@ Description=ansible-pull failure notifier
 
 [Service]
 Type=oneshot
-ExecStart=/usr/local/sbin/ansible-pull-failure-notify.sh
+ExecStart=ansible-pull-failure-notify
 User=root