WASHINGTON — The Supreme Court says it will not hear arguments as planned March 1 in a case involving a Trump-era immigration policy used several millions of times over the past three years to quickly turn away migrants at the border.The justices on Thursday removed from their calendar the case involving Title 42, which justified the quick expulsion of migrants on public health grounds. A court spokeswoman provided no explanation and the case has not been dismissed. The court’s action follows a legal filing …