feat: Show ANs in admin view of user

src/fellchensammlung/models.py

@@ -74,6 +74,10 @@ class User(AbstractUser):
     def get_num_unread_notifications(self):
         return BaseNotification.objects.filter(user=self, read=False).count()
 
+    @property
+    def adoption_notices(self):
+        return AdoptionNotice.objects.filter(owner=self)
+
     @property
     def owner(self):
         return self