AUSTIN, Texas — The Justice Department on Monday appealed a Texas court ruling that would halt approval of the most commonly used method of abortion in the U.S., calling the decision “extraordinary and unprecedented.”The request to the 5th U.S. Circuit Court of Appeals was filed just days after conflicting court rulings over the legality of the abortion medication mifepristone put in doubt access to the drug that has been widely available for more than 20 years.U.S. District Judge Matthew Kacsmaryk, an …