fix(queue): route scheduled jobs through crons helper

Centralize scheduled job queue selection with crons_queue() and use it for scheduler, task, and database backup jobs so cloud runs on crons while self-hosted stays on high.

app/Jobs/ScheduledTaskJob.php

@@ -65,7 +65,7 @@ class ScheduledTaskJob implements ShouldBeEncrypted, ShouldQueue
 
     public function __construct($task)
     {
-        $this->onQueue('high');
+        $this->onQueue(crons_queue());
 
         $this->task = $task;
         if ($service = $task->service()->first()) {