HARRISBURG, Pa. — The University of Pennsylvania’s president has resigned amid pressure from donors and criticism over testimony at a congressional hearing where she was unable to say under repeated questioning that calls on campus for the genocide of Jews would violate the school’s conduct policy.The chairman of the Ivy League school’s board of trustees, Scott Bok, also resigned immediately during a trustees meeting Saturday evening, just hours after Bok announced Liz Magill’s departure as …