Immigration and Customs Enforcement officers arrested Blerim Skoro outside an immigration office in New Jersey this month as he renewed his papers. Skoro is 55, was born in Kosovo, works as a cab driver on Staten Island in New York, and has an American wife and three children. His lawyers filed papers in federal court to stop the government from sending him out of the country. They say he spent years working as a CIA informant after the Septembe…