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/01_core.yml

@@ -0,0 +1,25 @@
+- name: "Include dependent services for '{{ systemctl_id }}'"
+  include_role:
+    name: '{{ item }}'
+  loop:
+    - sys-ctl-alm-telegram
+    - sys-ctl-alm-email
+  vars:
+    flush_handlers: true
+    systemctl_timer_enabled: false
+    systemctl_copy_files: true
+
+- name: "Include core service for '{{ systemctl_id }}'"
+  include_role:
+    name: sys-systemctl
+  vars:
+    flush_handlers: true
+    systemctl_timer_enabled: false
+    systemctl_copy_files: true
+    systemctl_tpl_exec_start: "{{ systemctl_script_exec }} %i"
+    systemctl_tpl_on_failure: "" # No on failure needed, because it's anyhow the default on failure procedure
+
+- name: "Send message to test service."
+  systemd:
+    name: "sys-ctl-alm-compose@{{ SYSTEMCTL_ALARM_COMPOSER_DUMMY_MESSAGE }}.service"
+    state: started