When two transgender Utah girls and their parents sued to stop a law passed three years ago that would ban them from participating in sports with other girls, they were going into eighth and ninth grades, fighting as they entered high school to share in the same pastimes as their peers. But as they enter their final years of high school, after three years in court and amid President Donald Trump’s second term in office, their case to run and swim with classmates who are their same gender has fallen apart.