Amazon will stop testing workers for COVID-19 at its warehouses at the end of this month, citing the availability of vaccines and free testing. The company began testing warehouse workers last year when tests were more difficult to secure. Warehouse workers, who were considered essential, packed and shipped orders throughout the pandemic. Amazon disclosed in October that nearly 20,000 workers, or about 1.4% of its total workforce, had been infected with COVID-19 by that point in 2020. Vaccines began to roll out about two months later and in May, employees who uploaded a picture of their vaccine cards to an…