JERUSALEM — Tens of thousands of Palestinians are no longer getting food aid or basic health services from America, U.S.-funded infrastructure projects have been halted, and an innovative peace-building program in Jerusalem is scaling back its activities. The Trump administration’s decision last year to cut more than $200 million in development aid to the Palestinians is forcing NGOs to slash programs and lay off staff as the effects ripple through a community that has spent more than two decades promoting peace in the Middle East. The U.S.