Earlier this year, Warner Bros. Discovery Chief Executive Officer David Zaslav ended his company's long relationship with the National Basketball Association. Now, he may be setting the stage to end his relationship with U.S. sports, altogether.WBD announced Monday it's splitting itself into two companies — a concept CNBC first reported had picked up steam in April. One company, temporarily called Streaming and Studios, will consist of Warner Bros. Television, Warner Bros. Motion Picture Group, DC Studios, ...