They’ve long been an unmissable part of public events in Mexico, from soccer matches to trade fairs: attractive women hired to be greeters or simply as eye candy, sometimes scantily clad in short skirts and high heels or crop-tops and hot pants emblazoned with corporate logos. Now Mexico City has prohibited the use of models known in local parlance as “edecanes” at events sponsored by the local government, breaking new ground for a country where …