By Arafat Barbakh, Simon Lewis and Nidal al-Mughrabi GAZA/ABU DHABI/CAIRO (Reuters) -Pressure grew on Israel on Monday from its staunch ally the United States and from Middle East powers to ease up on its assault on Gaza as its forces inflicted the highest daily Palestinian death toll so far this year in the war against Hamas. U.S. Secretary of State Antony Blinken was visiting the region in a bid to prevent the conflict – now entering its fourth month – from turning into a regional conflagration. He was due to arrive in Israel late on Monday after a day meeting Gulf Arab leaders. Israeli offi…