NEW YORK — It was bad enough that New York’s most famous prosecutor, Preet Bharara, lost in the sweepstakes to become the next U.S. attorney general nominee to a fellow federal prosecutor from his own city. But Bharara and his team in the Manhattan U.S. attorney’s office have also suffered some major setbacks in recent months of a kind not seen since he arrived on the job nearly six years ago. They include a federal appeals court’s dismissal of insider trading convictions against two men and …