Implement dynamic TimeoutStartSec filter for domains and update roles

- Added new filter plugin 'timeout_start_sec_for_domains' to calculate TimeoutStartSec based on number of domains.
- Updated sys-ctl-hlth-csp and sys-ctl-hlth-webserver tasks to use the filter.
- Removed obsolete systemctl.service.j2 in sys-ctl-hlth-csp.
- Adjusted variable naming (CURRENT_PLAY_DOMAINS_ALL etc.) in multiple roles.
- Updated srv-letsencrypt and sys-svc-certs to use uppercase vars.
- Switched pretix role to sys-stk-full-stateful and removed leftover javascript.js.
- Added unittests for the new filter under tests/unit/filter_plugins.

See conversation: https://chatgpt.com/share/68b1ae9a-1ac0-800f-b49d-2915386a1a23

roles/sys-ctl-hlth-csp/tasks/01_core.yml

@@ -16,4 +16,5 @@
     system_service_on_calendar:           "{{ SYS_SCHEDULE_HEALTH_CSP_CRAWLER }}"
     system_service_timer_enabled:         true
     system_service_tpl_on_failure:        "{{ SYS_SERVICE_ON_FAILURE_COMPOSE }}"
-    system_service_tpl_timeout_start_sec: 15min
+    system_service_tpl_timeout_start_sec: "{{ CURRENT_PLAY_DOMAINS_ALL | timeout_start_sec_for_domains }}"
+    system_service_tpl_exec_start:        "{{ system_service_script_exec }} --nginx-config-dir={{ NGINX.DIRECTORIES.HTTP.SERVERS }}"