NEW YORK — Mazi Melesa Pilip and Tom Suozzi made their closing cases to Long Island and Queens voters Monday, on the eve of their ultracompetitive special House election for the seat vacated by George Santos. Pilip, the Republican nominee, argued that Suozzi, the Democrat, is soft on immigration, as Suozzi framed himself as an “antidote” to poisonous partisanship that he said is blocking progress and is personified by Pilip. The race is weighty in both symbolism and function, providing possible insights into which way the political wind is blowing in a swing suburban district, and delivering D…