Jake Coyle, The Associated Press The Cannes Film Festival, which will kick off Tuesday, is such a colossal extravaganza that taking measure of its ups and downs is notoriously difficult. It’s a showcase of the world’s best cinema. It’s a red-carpet spectacular. It’s a French Riviera hive of dealmaking. But by at least some metrics, Cannes — following a canceled 2020 festival, a much-diminished 2021 edition and a triumphant 2022 return — is finally all the way back. “Let’s just say it’s gotten very hard to get restaurant reservations again,” says Christine Vachon, the veteran producer and longtime collaborator of...