By Lawrence Hurley WASHINGTON (Reuters) – The U.S. Supreme Court has not yet released its decision that looks set to dramatically scale back abortion rights, but one of the next legal battles has already begun in a Mississippi court. That is where the manufacturer of a pill used to carry out medication abortions, Las Vegas-based GenBioPro Inc, has filed a federal lawsuit challenging the conservative state’s restrictions on the pill, used in more than half of all U.S. abortions. Litigation over medication abortion, approved for use at up to 10 weeks of pregnancy, is likely to take center stage …