BRUSSELS — The EU’s response to U.S. and Israeli strikes on Iran has laid bare familiar divisions at the top, with two of its most senior officials on a collision course over who coordinates the bloc’s reaction to the crisis. In the early hours of Saturday morning, as smoke rose over Tehran, Commission President Ursula von der Leyen and European Council President António Costa raced to set the tone of the response with a joint statement calling for “maximum restraint.” But they were beaten to