U.S. stock index futures were largely flat on Friday ahead of September jobs data that is likely to set off the Federal Reserve’s withdrawal of its policy support later this year. Wall Street rallied on Thursday, led by mega-cap technology stocks as the U.S. Senate approved legislation to temporarily raise the federal government’s $28.4 trillion debt limit, averting the risk of a historic default this month. Uncertainty over the debt ceiling negotiations and a run-up in U.S. Treasury yields over elevated inflation were major concerns among investors, injecting volatility in equity markets this week. Still, better-than-expected private jobs data and weekly jobless claims report reinforced positive views about an economic recovery, setting the three major U.S. indexes for weekly gains. The Labor Department’s closely watched nonfarm payrolls report, due at 8:30 a.m. ET, will show hiring surged by 500,000 jobs in September as the summer wave of COVID-19 infections began …