Remove unneeded span

This would create an excessive number of spans for larger queries.  The FastAPI telemetry is already tracking the time spent in sending the results to the client, so we can see it without adding an additional span.

python/lsst/daf/butler/remote_butler/server/handlers/_query_streaming.py

@@ -180,8 +180,7 @@ async def _enqueue_query_pages(
             async with contextmanager_in_threadpool(query.setup()) as ctx:
                 with telemetry.span("Read from DB and send results"):
                     async for page in iterate_in_threadpool(query.execute(ctx)):
-                        with telemetry.span("Wait for caller to read results"):
-                            await queue.put(page)
+                        await queue.put(page)
     except ButlerUserError as e:
         # If a user-facing error occurs, serialize it and send it to the
         # client.