Lt. Jonathan Rivera, who NYPD Commissioner Jessica Tisch refused to fire for killing Washington Heights man Allan Feliz, pleaded guilty last week to an Abuse of Authority allegation for unlawful summons from a 2023 incident. He will likely lose 20 vacation days, but keep his job after a separate substantiated misconduct complaint for an offense potentially punishable by termination. Previous calls to fire Rivera stem from him fatally shooting Fe…