AUGUSTA SARAIVA, COURTNEY MCBRIDE Bloomberg News The United Nations fired several staffers at its Palestinian refugee agency over Israeli allegations that they took part in the Oct. 7 attack by Hamas, news that prompted the U.S. to suspend funding. U.N. Secretary-General Antonio Guterres “is horrified by the news” that workers with the U.N. Relief and Works Agency, or UNRWA, may have been…