[TASK] Extend ModifyUserMessageAttachmentsEvent

The ModifyUserMessageAttachmentsEvent event has been extended
with the $customNotification property. This can be used to
add attachments to email sent using the backend module.

Refs #1178

Classes/Event/ModifyUserMessageAttachmentsEvent.php

@@ -11,6 +11,7 @@
 
 namespace DERHANSEN\SfEventMgt\Event;
 
+use DERHANSEN\SfEventMgt\Domain\Model\Dto\CustomNotification;
 use DERHANSEN\SfEventMgt\Domain\Model\Registration;
 use DERHANSEN\SfEventMgt\Service\NotificationService;
 
@@ -25,6 +26,7 @@ public function __construct(
         private readonly Registration $registration,
         private readonly int $type,
         private readonly array $settings,
+        private readonly ?CustomNotification $customNotification,
         private readonly NotificationService $notificationService
     ) {
     }
@@ -49,6 +51,11 @@ public function getSettings(): array
         return $this->settings;
     }
 
+    public function getCustomNotification(): ?CustomNotification
+    {
+        return $this->customNotification;
+    }
+
     public function getNotificationService(): NotificationService
     {
         return $this->notificationService;

Classes/Service/NotificationService.php

@@ -224,6 +224,7 @@ public function sendUserMessage(
                 $registration,
                 $type,
                 $settings,
+                $customNotification,
                 $this
             );
             $this->eventDispatcher->dispatch($modifyUserAttachmentsEvent);