The sheriff will stop sharing license plate data with federal agencies like Immigration and Customs Enforcement, according to the terms of a settlement signed last week by the American Civil Liberties Union, the Marin County Sheriff’s Office and local activists. The A.C.L.U. sued the sheriff last year on behalf of three immigration activists, alleging the agency was violating California law by allowing ICE, Customs and Border Patrol and various out-of-state law enforcement entities to view…