JERUSALEM, May 13 (Reuters) - Israeli Prime Minister Benjamin Netanyahu made a secret trip to the United Arab Emirates and met Emirati President Sheikh Mohammed bin Zayed during the war with Iran, Netanyahu's office said on Wednesday, confirming for the first time that the two leaders had met. The Prime Minister's Office said the encounter produced a "historic breakthrough" in ties between Israel and the UAE. A source familiar with the matter said Netanyahu and Sheikh Mohammed bin Zayed, widely known as MBZ, met in Al-Ain,…