The city’s detective union is escalating its war against rabid cop haters, pushing to have NYPD officers added to a federal law that requires protesters stay 25 feet away from ICE officers, The Post has learned. The Halo Act would fine or imprison protesters who get within the buffer zone and impinge on the law enforcement officers’ ability to do their jobs, according to Detectives Endowment Association President Scott Munro, who said he’s traveling to Washington, DC this week to meet with