BRUSSELS — Marieke Ehlers has one of the most important jobs in Europe’s far right: Turning a movement built on opposing Brussels into one capable of shaping its laws. She’s the chief whip of the Patriots for Europe, the third-largest group in the European Parliament, at a time when the far right is playing a much larger and more influential role both in Brussels and across the continent. Ehlers takes on her new role as the so-called cordon sanitaire — in which centrist forces agreed to keep