🛂(backend) stop throttling collaboration servers

We observe some throttling pick here and there.
We observed that when the collaboration has a
problem, it is retrying to connect, leading to more
requests to the django backend. At one point, the
throttling is reached and the user would not
be able to use the application anymore.
Now when the request comes from a collaboration
server, we do not throttle it anymore.

src/backend/core/api/viewsets.py

@@ -55,7 +55,11 @@ from core.utils import extract_attachments, filter_descendants
 
 from . import permissions, serializers, utils
 from .filters import DocumentFilter, ListDocumentFilter, UserSearchFilter
-from .throttling import UserListThrottleBurst, UserListThrottleSustained
+from .throttling import (
+    DocumentThrottle,
+    UserListThrottleBurst,
+    UserListThrottleSustained,
+)
 
 logger = logging.getLogger(__name__)
 
@@ -373,6 +377,7 @@ class DocumentViewSet(
     permission_classes = [
         permissions.DocumentPermission,
     ]
+    throttle_classes = [DocumentThrottle]
     throttle_scope = "document"
     queryset = models.Document.objects.select_related("creator").all()
     serializer_class = serializers.DocumentSerializer