By Steve Holland and Ali Sawafta BETHLEHEM, West Bank (Reuters) -U.S. President Joe Biden promised on Friday not to give up efforts to end the decades-long Israeli Palestinian conflict, though he offered no new proposals to restart the stalled political dialogue between the two sides. As he wrapped up the first leg of a Middle Eastern trip before departing for Saudi Arabia, Biden visited a hospital in East Jerusalem and pledged a multi-year $100 million package of financial and technical help. But after a meeting with Palestinian President Mahmoud Abbas in the occupied West Bank town of Bethle…