By Brenda Goh and Hallie Gu SHANGHAI/BEIJING (Reuters) – Some of Shanghai’s 25 million people came out for brief walks and grocery shopping on Tuesday after enduring more than a month under a COVID lockdown, while China’s capital Beijing embarked on another round of mass testing to control a nascent outbreak. Social media posts showed Shanghai residents strolling in their suburbs, or queuing up at supermarkets that had been allowed to reopen. One picture showed two women carrying a pole with four bulky bags of groceries on their shoulders. That was the result of an incremental easing of curbs …