By Brenda Goh SHANGHAI (Reuters) -Mainland China reported more than 1,500 new local COVID-19 infections on Saturday, the most since the first nationwide outbreak in early 2020, as the Omicron variant prompted Beijing to introduce self-testing kits for the first time. China’s current case count is far fewer than those of many other countries, but the growing number could complicate Beijing’s “dynamic-clearance” ambition to suppress contagion as quickly as possible. The National Health Commission on Saturday said it had found 476 locally transmitted cases for Friday, including five people initia…