WASHINGTON — Have you heard the one about the Sikh, the Hasidic Jew, the Muslim and the nun who walked into a job interview? Supreme Court Justice Samuel A. Alito Jr. channeled his inner stand-up comic Wednesday in indicating that he and most of the court would side with a Muslim woman who showed up for a job interview with Abercrombie & Fitch wearing a black headscarf. She didn’t get hired. Samantha Elauf, the woman at the center of the case about religious discrimination in hiring, was in the …