RecruitingPhase 2Biological interventionPhase 2 Study Evaluating Rapcabtagene Autoleucel in Participants With Severe Active GPA or MPAThe purpose of this study is to evaluate the efficacy and safety of rapcabtagene autoleucel versus comparator in participants with severe active Granulomatosis with Polyangiitis (GPA) or Microscopic Polyangiitis (MPA)