Refactor alarm compose service and systemctl templates

- Fixed bug where not both alarm services (email + telegram) were triggered.
- Removed direct OnFailure references for email and telegram,
  now handled by unified compose service.
- Introduced 01_core.yml in sys-ctl-alm-compose to structure
  role execution (subservices → core service → test run).
- Added configurable variables SYSTEMCTL_ALARM_COMPOSER_SUBSERVICES
  and SYSTEMCTL_ALARM_COMPOSER_DUMMY_MESSAGE.
- Replaced dedicated @.service template with generic systemctl template
  using systemctl_tpl_* variables for flexibility.
- Updated script.sh.j2 to collect exit codes and print clear errors.
- Fixed typos and streamlined vars in sys-systemctl.

See conversation: https://chatgpt.com/share/68a46172-7c3c-800f-a69c-0cb9edd6839f

roles/sys-ctl-alm-compose/tasks/main.yml

@@ -1,14 +1,4 @@
 - block:
-  - name: "Include '{{ systemctl_id }}'"
-    include_role:
-      name: '{{ item }}'
-    loop:
-      - sys-ctl-alm-telegram
-      - sys-ctl-alm-email
-      - sys-systemctl
-    vars:
-      flush_handlers: true
-      systemctl_timer_enabled: false
-      systemctl_copy_files: false
+  - include_tasks: 01_core.yml
   - include_tasks: utils/run_once.yml
   when: run_once_sys_ctl_alm_compose is not defined