Twenty years after TV’s most notorious extreme makeover show “The Swan” aired, former contestant Kari Bravata claims that she “almost died for reality TV.” She spoke with Page Six about the new Hulu doc, “The Swan: Behind the Mirror.” Director Erin Lee Carr also told us: “I think it was one of the most sadistic…Twenty years after TV’s most notorious extreme makeover show “The Swan” aired, former contestant Kari Bravata claims that she “almost died for reality TV.” She spoke with Page Six about the new Hulu doc, “The Swan: Behind the Mirror.” Director Erin Lee Carr also told us: “I think it was one of the most sadistic…