Uber’s stock looked to rally after quarterly profit and bookings beat expectations, and a $20 billion share-repurchase program was announced. Shares of Uber Technologies Inc. were driven higher in early Wednesday trading after the ride-hailing giant beat a number of second-quarter financial metrics and announced a big stock-buyback plan. Chief Executive Dara Khosrowshahi provided an upbeat outlook for the company, saying Uber’s full potential is only beginning to be unlocked as it now has “20...