By Noel Randewich and Shreyashi Sanyal (Reuters) – Wall Street ended sharply higher on Wednesday after Federal Reserve Chair Jerome Powell said the central bank might scale back the pace of its interest rate hikes as soon as December. The S&P 500 rallied from an earlier loss and the Nasdaq jumped after the release of Powell’s remarks prepared for delivery at the Brookings Institution think tank in Washington. Powell also cautioned that the fight against inflation was far from over and that key questions remain unanswered, including how high rates will ultimately need to rise and for how long. …