By Michael Martina WASHINGTON (Reuters) -The U.S. State Department is considering whether to authorize departures for American diplomats and their families in China who wish to leave due to the U.S. government’s inability to prevent Chinese authorities from subjecting them to intrusive pandemic control measures, sources told Reuters. Two sources familiar with the issue said the U.S. Embassy on Monday had sent the request to Washington for formal sign off, as China ramps up COVID-19 containment protocols ahead of the opening of the Beijing Winter Olympics in less than two weeks. The sources, sp…