As Tesla prepares to finally end its closed-loop production system at Gigafactory Shanghai tomorrow , returning to normal operations, the automaker has shared a thank you letter with employees who have worked during the recent COVID-19 outbreak. Tesla sent a thank you letter to all of its employees at Giga Shanghai for their hard work during the closed-loop production system over the past few months, as sent to employees on Friday (via @bentv_sh ). In the letter, roughly translated from Chinese, Tesla says, “To every Tesla employee aboard the ship — Thanks to over 16,000 people [who were] superheroes stationed…