Brian Steinberg Senior TV EditorJulie Townsend, longtime head of communications for ABC News, will leave the Disney unit as it prepares to welcome a new president.Townsend, a VP who has supervised outreach on behalf of flagship news programs ranging from “Good Morning America” to “World News Tonight,” will leave May 14 “to lead global consumer communications at an iconic American company” that she said in a memo to staffers would be revealed at a later date.“This was not an easy decision to