Staten Island parents are fuming over Mayor Zohran Mamdani’s decision to leave Staten Island out of his lofty free 2-K pilot program . Mamdani and Gov. Kathy Hochul announced Tuesday the five city school districts that will be eligible to apply for the 2,000 spots launching in the fall — but left out the “forgotten borough.” “I know it’s like the lottery but to get shut out? Not even a chance? What’s the matter, too many registered Republicans here?” seethed Diane, a mother of three who