Two young Jewish Argentine tourists wearing kippahs were attacked outside a Milan supermarket Sunday night and one of them suffered a broken nose, Italian dailies reported Tuesday.     First they were insulted, being called 'sh**ty Jews, then attacked with punches to the face, according to Corriere della Sera, Repubblica, Il Giorno, and Libero.     The latter paper said the anti-Semitic attack was divulged by the president of Milan's Jewish community, Walker Meghnagi.     The Carabinieri of the