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.
FutureMergedMutatedPartPtr future_part_,
    size_t total_size,
    StorageMergeTree & storage_,
    const StorageMetadataPtr & metadata_snapshot,
    bool is_mutation)
    : future_part(future_part_), storage(storage_)
{
    
    
    if (is_mutation)
        reserved_space = storage.tryReserveSpace(total_size, future_part->parts[0]->volume);
    else
    {
        IMergeTreeDataPart::TTLInfos ttl_infos;
        size_t max_volume_index = 0;
        for (auto & part_ptr : future_part->parts)
        {
            ttl_infos.update(part_ptr->ttl_infos);
            max_volume_index = std::max(max_volume_index, storage.getStoragePolicy()->getVolumeIndexByDisk(part_ptr->volume->getDisk()));
        }
        reserved_space = storage.balancedReservation(
            metadata_snapshot,
            total_size,
            max_volume_index,
            future_part->name,
            future_part->part_info,
            future_part->parts,
            &tagger,
            &ttl_infos);
        if (!reserved_space)