Brad Pitt has reportedly signed on to appear in “The Movie Critic,” widely believed to be director Quentin Tarantino’s final film. Pitt previously won an Academy Award for his work on Tarantino’s 2019 flick “Once Upon a Time in Hollywood.” Like much that work, “The Movie Critic” appears to involve shady characters with Hollywood ties, according to Deadline, which reported the reunion on Thursday. “[The film] is based on a guy who really lived, but was never really famous, and he used to write movie reviews for a porno rag,” Tarantino said last May. It’s currently unclear what Pitt’s part will …