NEW: NYC Mayor Mamdani is being sued by a group representing immigrant-owned NYC grocers over his plan to open five city-run grocery stores across the city. Th

NEW: NYC Mayor Mamdani is being sued by a group representing immigrant-owned NYC grocers over his plan to open five city-run grocery stores across the city. The group says small businesses would be forced to compete against taxpayer-funded stores, with one East Harlem grocer warning a planned locat…