For some reasons when we delete a MergeTree Part in atomic way something may go wrong - and leave the `delete_tmp_*` folder or it's part on disk. This may lead to a disk space consumption over time.

It's suggested to delete this folders at least at server start-up. Current solution with `clearOldTemporaryDirectories()` doesn't work because this method is called periodically from a thread without any locks or advisory on folders - it may cause the race conditions.
{
            UInt64 total_size_of_part = 0;
            Strings filenames = backup->listFiles(data_path_in_backup + part_name + "/", "");
            for (const String & filename : filenames)
                total_size_of_part += backup->getFileSize(data_path_in_backup + part_name + "/" + filename);
            std::shared_ptr<IReservation> reservation = storage->getStoragePolicy()->reserveAndCheck(total_size_of_part);
            auto disk = reservation->getDisk();
            String relative_data_path = storage->getRelativeDataPath();
            auto temp_part_dir_owner = std::make_shared<TemporaryFileOnDisk>(disk, relative_data_path + "restoring_" + part_name + "_");
            String temp_part_dir = temp_part_dir_owner->getPath();
            disk->createDirectories(temp_part_dir);
            assert(temp_part_dir.starts_with(relative_data_path));
            String relative_temp_part_dir = temp_part_dir.substr(relative_data_path.size());
            for (const String & filename : filenames)
            {
                auto backup_entry = backup->readFile(fs::path(data_path_in_backup) / part_name / filename);
                auto read_buffer = backup_entry->getReadBuffer();
                auto write_buffer = disk->writeFile(fs::path(temp_part_dir) / filename);
                copyData(*read_buffer, *write_buffer);
                reservation->update(reservation->getSize() - backup_entry->getSize());
            }
            auto single_disk_volume = std::make_shared<SingleDiskVolume>(disk->getName(), disk, 0);
            auto part = storage->createPart(part_name, part_info, single_disk_volume, relative_temp_part_dir);
            
            disk->removeFileIfExists(fs::path(temp_part_dir) / IMergeTreeDataPart::TXN_VERSION_METADATA_FILE_NAME);
            part->version.setCreationTID(Tx::PrehistoricTID, nullptr);
            part->loadColumnsChecksumsIndexes(false, true);
            sink->writeExistingPart(part);