The chief financial officer of troubled Bed Bath & Beyond has been identified as the man who jumped to his death from the iconic new Tribeca skyscraper known as the “Jenga Building,” The Post has learned. Gustavo Arnal, 52, who was also an executive vice president for the struggling home goods retailer, plunged from the 18th floor of 56 Leonard Street on Friday, police sources said. The 60-story building is best known for its purposely misaligned apartments stacked atop each other, resembling the popular game “Jenga.” Messages left with Bed Bath & Bed and Arnal’s family Saturday were not immediately...