NEW YORK — Early voting started Saturday in the heated congressional special election to pick a successor to disgraced ex-Rep. George Santos for a Long Island swing seat that could further reduce the already razor-thin GOP majority in the House of Representatives. Democratic ex-Rep. Tom Suozzi is battling upstart Republican Mazi Melesa Pilip in an unusual mid-winter contest in which the winner will head to Washington, D.C., to serve out the remainder of what was supposed to be a two-year term for Santos, the controversial conservative Republican who was expelled by the House in December over a…