A homeless arsonist tossed Molotov cocktails at a Tesla Cybertruck on an upscale Manhattan block Monday morning, setting it ablaze, cops and law-enforcement sources said. Dwain Burr, 40, first dumped garbage on the hood of the electric vehicle parked on East 58th Street near Second Avenue in Sutton Place around 1:15 a.m., authorities said. Then he placed what appeared to be a Molotov cocktail on its rear passenger tire — causing it to erupt in flames — and tossed another one at the unoccupied vehicle, police sources said. A good Samaritan used a fire extinguisher to knock down the flames,...