This method is used in DagFileProcessor.process_file - it may be easier to migrate all it's internal calls instead of the whole method.
return self._file_path
    @staticmethod
    def _run_file_processor(
        result_channel: MultiprocessingConnection,
        parent_channel: MultiprocessingConnection,
        file_path: str,
        pickle_dags: bool,
        dag_ids: list[str] | None,
        thread_name: str,
        dag_directory: str,
        callback_requests: list[CallbackRequest],
    ) -> None: