fix: Email should be retried with backoff

app/Notifications/Database/BackupFailed.php

@@ -3,20 +3,12 @@
 namespace App\Notifications\Database;
 
 use App\Models\ScheduledDatabaseBackup;
+use App\Notifications\CustomEmailNotification;
 use App\Notifications\Dto\DiscordMessage;
-use Illuminate\Bus\Queueable;
-use Illuminate\Contracts\Queue\ShouldQueue;
 use Illuminate\Notifications\Messages\MailMessage;
-use Illuminate\Notifications\Notification;
 
-class BackupFailed extends Notification implements ShouldQueue
+class BackupFailed extends CustomEmailNotification
 {
-    use Queueable;
-
-    public $backoff = 10;
-
-    public $tries = 2;
-
     public string $name;
 
     public string $frequency;