Will Thorne Staff WriterPeacock has unveiled a slate of original films, all of which will debut on the service in September.The NBCU streamer, which launched nationally just over a month ago, will premiere a doc on Harry Belafonte’s brief stint hosting “The Tonight Show,” Emilio Estevez’s pic “The Public,” starring Alec Baldwin, and a doc from NFL star Malcolm Jenkins which celebrates the humanity of Black men and boys.“The Sit-In: Harry Belafonte Hosts the Tonight Show” was supposed to launch