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.
{
    std::lock_guard lock(storage.currently_submerging_emerging_mutex);
    for (const auto & part : submerging_parts)
    {
        if (!storage.currently_submerging_big_parts.contains(part))
        {
            LOG_ERROR(log, "currently_submerging_big_parts doesn't contain part {} to erase. This is a bug", part->name);
            assert(false);
        }
        else
            storage.currently_submerging_big_parts.erase(part);
    }
    storage.currently_emerging_big_parts.erase(emerging_part_name);
}
}