NEW YORK — A 32-year-old runner collapsed at the Coney Island finish line of the Brooklyn half-marathon race and died at a nearby hospital on a sticky Saturday morning where 16 other participants were injured, authorities said. David Reichman of Brooklyn died at Coney Island Hospital, becoming the second runner to die during the race since 2014. He went down while finishing the run on a spring day when the humidity hit 74% with temperatures in the 70s. Fifteen other runners were treated for assorted injuries at the same facility after the annual 13.1-mile run from the Brooklyn Museum to the ne…