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.
create_result = createLogEntryToMutatePart(
                        *part,
                        future_merged_part->uuid,
                        desired_mutation_version->first,
                        desired_mutation_version->second,
                        merge_pred.getVersion());
                    if (create_result == CreateMergeEntryResult::Ok ||
                        create_result == CreateMergeEntryResult::LogUpdated)
                        break;
                }
            }
        }
    }
    catch (...)
    {
        tryLogCurrentException(log, __PRETTY_FUNCTION__);
    }
    if (!is_leader)
        return;
    if (create_result != CreateMergeEntryResult::Ok
        && create_result != CreateMergeEntryResult::LogUpdated)
    {
        merge_selecting_task->scheduleAfter(storage_settings_ptr->merge_selecting_sleep_ms);
    }
    else
    {
        merge_selecting_task->schedule();
    }
}
void StorageReplicatedMergeTree::mutationsFinalizingTask()