By Marie-Louise Gumuchian LONDON (Reuters) – A critically-acclaimed revival of musical “Cabaret” and a stage adaptation of hit novel “Life of Pi” were the big winners at the Olivier Awards on Sunday, scooping the top prizes in Britain’s biggest night for theatre. After a two-year hiatus due to the COVID-19 pandemic, the London theatre community reunited for a glitzy ceremony at the Royal Albert Hall. “Cabaret” had led nominations with 11 nods. It won seven awards, including best musical revival and prizes for actors Eddie Redmayne and Jessie Buckley. “This is the dream… This was the part tha…