WASHINGTON — A spokesman for Mike Pence said Wednesday that the former vice president will not appeal a judge’s order compelling him to testify in the Justice Department’s investigation into efforts by Donald Trump and his allies to overturn the results of the 2020 election.The decision sets up a possible appearance by Pence in the coming weeks before a federal grand jury scrutinizing attempts by the former president and supporters before the riot at the Capitol on Jan. 6, 2021, to undo Democrat Joe Biden …