WASHINGTON — Senate GOP leader Mitch McConnell said Tuesday that Republicans won’t allow Democrats to temporarily replace California Sen. Dianne Feinstein on the Senate Judiciary Committee, arguing that they only want a stand-in to push through the most partisan judges.McConnell called the effort to place a substitute on the panel as Feinstein recovers from a case of shingles “an extremely unusual” request with no known precedent.“Let’s be clear,” said McConnell in remarks on the …