NEW YORK — Donald Trump and former top executives of his family business were found liable for large-scale fraud Friday, ordered to pay back more than $368 million in illegal gains and barred from the real estate industry for three years — a crushing ruling from Judge Arthur Engoron that demolishes the former president’s decadeslong legacy as a major-league developer in his native New York City. In his ruling, Engoron found Trump, his sons, Eric and Don Jr., and former top Trump Organization executives Allen Weisselberg and Jeffrey McConney liable for multiple fraud claims in state Attorney Ge…