The roles played by Ewan McGregor have taken him far: to a galaxy far, far away (three “Star Wars” prequels and their small-screen follow-up, “Obi-Wan Kenobi”); to post-Bolshevik Revolution Russia (“A Gentleman in Moscow”); even to the bottom of the worst toilet in Scotland (“Trainspotting,” the second of four collaborations with filmmaker Danny Boyle). Yet […]