By Eduardo Baptista and Brenda Goh BEIJING/SHANGHAI (Reuters) -China defended on Thursday its handling of its raging COVID-19 outbreak after U.S. President Joe Biden voiced concern and the World Health Organisation (WHO) said Beijing was under-reporting virus deaths. The WHO’s emergencies director, Mike Ryan, said on Wednesday that Chinese officials were under-representing data on several fronts, some of the U.N. agency’s most critical remarks to date. China scrapped its stringent COVID controls last month after protests against them, abandoning a policy that had shielded its 1.4 billion popul…