By Manas Mishra (Reuters) -The world has never been in a better position to end the COVID-19 pandemic, the head of the World Health Organization said on Wednesday, his most optimistic outlook yet on the years-long health crisis which has killed over six million people. “We are not there yet. But the end is in sight,” WHO Director-General Tedros Adhanom Ghebreyesus told reporters at a virtual press conference. That was the most upbeat assessment from the UN agency since it declared an international emergency in January 2020 and started describing COVID-19 as a pandemic three months later. The v…