Remove matrix_playbook_traefik_role_enabled variable and devture-traefik references

The variable was necessary when multiple playbooks could have
potentially tried to manage a shared `devture-traefik.serivce` systemd service
and shared `/devture-traefik` directory.

Since adcc6d9723, we use our own `/matrix/traefik`
(`matrix-traefik.service`) installation and no conflicts can arise.
It's safe to always enable the role, just like we do with all the other roles.

roles/custom/matrix-base/defaults/main.yml

@@ -284,7 +284,7 @@ matrix_homeserver_app_service_config_files_auto: []
 # Valid options and a description of their behavior:
 #
 # - `playbook-managed-traefik`
-#     - the playbook will install devture-traefik
+#     - the playbook will run a managed Traefik instance (matrix-traefik)
 #     - Traefik will do SSL termination, unless you disable it (e.g. `devture_traefik_config_entrypoint_web_secure_enabled: false`)
 #     - if SSL termination is enabled (as it is by default), you need to populate: `devture_traefik_config_certificatesResolvers_acme_email`
 #     - it will also install matrix-nginx-proxy in local-only mode, while we migrate the rest of the services to a Traefik-native mode of working

roles/custom/matrix_playbook_migration/tasks/main.yml

@@ -12,7 +12,7 @@
     - setup-all
     - install-all
 
-- when: matrix_playbook_traefik_role_enabled | bool
+- when: devture_traefik_enabled | bool
   block:
     - ansible.builtin.include_tasks: "{{ role_path }}/tasks/devture_traefik_to_matrix_traefik.yml"
   tags:

roles/custom/matrix_playbook_migration/tasks/validate_config.yml

@@ -37,6 +37,7 @@
     - {'old': 'matrix_prometheus_node_exporter_metrics_proxying_enabled', 'new': 'matrix_prometheus_services_proxy_connect_prometheus_node_exporter_metrics_proxying_enabled'}
     - {'old': 'matrix_prometheus_postgres_exporter_metrics_proxying_enabled', 'new': 'matrix_prometheus_services_proxy_connect_prometheus_postgres_exporter_metrics_proxying_enabled'}
     - {'old': 'matrix_playbook_traefik_certs_dumper_role_enabled', 'new': 'devture_traefik_certs_dumper_enabled'}
+    - {'old': 'matrix_playbook_traefik_role_enabled', 'new': 'devture_traefik_enabled'}
 
 - name: (Deprecation) Catch and report matrix_postgres variables
   ansible.builtin.fail: