By John Revill ZURICH (Reuters) -Cartier jewellery maker Richemont missed market forecasts during its latest quarter as the resurgence of COVID-19 in China hit sales there, highlighting the country’s importance for the luxury sector. Richemont’s sales plunged by nearly a quarter in mainland China as customers stayed away from shops and a lack of staff led to temporary closures and shorter opening hours at its luxury boutiques, the Geneva-based company said on Wednesday. China has been a main driver of an explosion in demand for Swiss watches, jewellery and accessories in recent years. British …