Refactor Slack notifications and enhance departmental progress calculation

- Replace `send_webhook_message` with `send_message` for improved Slack notification rendering using `goals_progress_alert_renderer`.
- Add methods for calculating and retrieving departmental progress and distribution in `goals_criteria`.
- Update `renderDanishPeriodSummary` and Slack cron logic to support departmental-specific summaries.
- Include departmental progress in serialized goal objects for better reporting.

services/nginx/app/cron/Cron.php

@@ -248,7 +248,7 @@ function GoalsProgressAlertsCron(): void
                             if (!$dept->exists()) { continue; }
                             $webhook = (string)$dept->slack_webhook->value();
                             if (empty($webhook)) { continue; }
-                            (new Slack())->send_webhook_message((string)$message, $webhook);
+                            (new Slack())->send_webhook_message((string)goals_progress_alert_renderer::render($criteria, $dept), $webhook);
                             $sentToDept = true;
                         }
                     }