By Andrea Shalal, Jeff Mason and Steve Holland WASHINGTON (Reuters) -U.S. President Joe Biden’s national security adviser will meet with Palestinian President Mahmoud Abbas in Ramallah on Friday about the war in Gaza and ensuring that the Hamas attack on Israel on Oct. 7 is never repeated, senior U.S. officials said. The adviser, Jake Sullivan, will discuss “ongoing efforts to revamp and revitalize” the Palestinian Authority and reining in “extremist settler violence” against Palestinians in the occupied West Bank, said one of the officials, who declined to be named. Sullivan said on Thursday …