By Echo Wang (Reuters) – U.S. stocks ended higher on Thursday as electric automaker Tesla rose on its stronger-than-expected quarterly results, which helped offset a slide in telecom and energy shares. Tesla shares surged while AT&T Inc tumbled, sending telecom shares down after the wireless carrier cut its cash flow forecast saying some subscribers were delaying bill payments. Energy stocks slipped on weak crude prices. Tesla’s profit benefited from a price hike of its cars, offsetting production challenges. Strong reports from the carmaker and streaming giant Netflix Inc have boosted megacap…