By Nell Mackenzie LONDON, Feb 10 (Reuters) - Billionaire investor William Ackman's Pershing Square fund reaped $2.7 billion on interest rate trades in 2022, but not enough to plug losses and the fund finished the year down almost 9%, according to an investor presentation seen by Reuters. U.S.stock indexes had a dismal 2022 with the S&P 500 slumping almost 20%, as the Federal Reserve battled soaring...