The green starting flag waved Saturday on the newest family-friendly attraction at Showboat Atlantic City — The Raceway at Lucky Snake. Under red and back balloons, Philadelphia developer Bart Blatstein, CEO of Tower Investments, Inc. and owner of Showboat Atlantic City, cut the ribbon on the 40,000-square-foot, indoor electric go-kart track. “We went around the country looking at indoor go-karts and designed what I think is the best indoor go-kart track in the country,” Blatstein told NJ Advance Media. The track located on the ground floor next toLucky Snake Arcade, which opened last year, is…