WASHINGTON — The Biden administration will end most of the last remaining federal COVID-19 vaccine requirements next week when the national public health emergency for the coronavirus ends, the White House said Monday.Vaccine requirements for federal workers and federal contractors, as well as foreign air travelers to the U.S., will end May 11. The government is also beginning the process of lifting shot requirements for Head Start educators, healthcare workers, and noncitizens at U.S. land borders.The requirements …