Automakers including Tesla Inc. TSLA, -3.66% and SAIC Motor Corp. 600104, +2.12% are aiming to resume production next week in Shanghai, people familiar with the matter said, as fears grow over the devastating impact on the economy of prolonging factory closures as a result of China’s stringent Covid-19 control measures. Meanwhile, more cities in China tightened Covid restrictions on Friday, including Xi’an, a city of around 13 million that emerged from weeks of lockdown just months ago, a sign China’s strict Covid measures as it struggles to contain the highly contagious Omicron variant will continue to weigh on its economy….