Merge pull request ClickHouse#78860 from jkartseva/azure-remove-redundant-list

Remove redundant ListBlobs calls in AzureBlobStorage

Author: jkartseva

src/Disks/ObjectStorages/AzureBlobStorage/AzureObjectStorage.cpp

@@ -71,10 +71,10 @@ class AzureIteratorAsync final : public IObjectStorageIteratorAsync
         if (client->IsClientForDisk())
             ProfileEvents::increment(ProfileEvents::DiskAzureListObjects);
 
-        batch.clear();
-        auto outcome = client->ListBlobs(options);
+        chassert(batch.empty());
         auto blob_list_response = client->ListBlobs(options);
         auto blobs_list = blob_list_response.Blobs;
+        batch.reserve(blobs_list.size());
 
         for (const auto & blob : blobs_list)
         {