“American Idol” top-five finalist Caleb Kennedy has left the show after a video surfaced showing him next to someone wearing what appears to be a Ku Klux Klan hood. A representative for the show confirmed to The Post that Kennedy will no longer be moving forward in the competition. The singer, 16, posted a statement about his departure on Instagram Wednesday. “Hey y’all, this is gonna be a bit of a surprise but I am no longer gonna be on ‘American Idol,’” he wrote. “There was a video that surfaced on the internet and it displayed actions that were...