Joe Otterson TV ReporterGlenn Gordon Caron, the high-profile TV producer behind hits such as “Moonlighting” and “Medium,” has exited his role as showrunner of CBS’ “Bull,” Variety has confirmed.In addition to no longer being the showrunner of “Bull,” Caron’s overall deal with CBS Studios has also ended. Reports emerged that he was dismissed after a studio investigation into an alleged toxic workplace.