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.
String getModeName() const;
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    MergeTreeData(const StorageID & table_id_,
                  const String & relative_data_path_,
                  const StorageInMemoryMetadata & metadata_,
                  ContextMutablePtr context_,
                  const String & date_column_name,
                  const MergingParams & merging_params_,
                  std::unique_ptr<MergeTreeSettings> settings_,
                  bool require_part_metadata_,
                  bool attach,
                  BrokenPartCallback broken_part_callback_ = [](const String &){});