Massachusetts prosecutors scolded a judge over the sweetheart deal she handed out to serial criminal Tyler Brown — who is accused of opening fire on random drivers on Monday — after he was convicted of trying to kill a cop years earlier. Brown, 46, pleaded guilty to armed assault with intent to murder in 2021, one year after he fired 13 rounds at Boston officers, including firing a .40 Glock semi-automatic at close range at one officer’s chest. Prosecutors recommended a 12-year prison sentence followed by five years of probation; however, Judge Janet Sanders handed out a five to six-year sentence with three years of probation — despite the fact that Brown was already on probation for a 2014 assault conviction at the time. Tyler Brown allegedly fired between 50 and 60 rounds during his crazed rampage in Cambridge, Massachusetts, Monday.…