👔(backend) add resolved thread to queryset

We need to include resolved threads in the queryset
of the ThreadViewSet, otherwise they won't be
included in the list of threads and we will not be
able to list resolved threads in the side panel.

src/backend/core/api/viewsets.py

@@ -2946,9 +2946,7 @@ class ThreadViewSet(
     permission_classes = [permissions.CommentPermission]
     pagination_class = None
     serializer_class = serializers.ThreadSerializer
-    queryset = models.Thread.objects.select_related("creator", "document").filter(
-        resolved=False
-    )
+    queryset = models.Thread.objects.select_related("creator", "document")
     resource_field_name = "document"
 
     def perform_create(self, serializer):