STRASBOURG — The head of the EU’s biggest political family has had a tough week keeping his party under control, with internal divisions on display on everything from climate goals to veggie burgers. On the day that Ursula von der Leyen faces two votes of no-confidence that could topple her and her Commission, Manfred Weber, leader of the European People’s Party of which von der Leyen is a member, is also under pressure. Weber is still racking up wins — such as slashing green rules for