CBS News has hired a well-regarded TV veteran as its No. 2 executive — even as insiders speculate that the broadcast giant’s boss is on the way out. The Tiffany Network appointed former ABC News executive Tom Cibrowski to the role of president and executive editor of CBS News, replacing Adrienne Roark, the former CBS News president of newsgathering, who left for a job at Tegna earlier this month. Cibrowski — a 25-year veteran of ABC News who served as executive producer of “Good Morning America” when it overtook NBC’s “Today” in the ratings — will have a wider purview...