Hong Kong’s leader has hailed the city’s mass testing scheme for Covid-19 a success, with at least 32 carriers identified through the programme and under a quarter of the population screened.On Tuesday, Chief Executive Carrie Lam Cheng Yuet-ngor said any doubts about the tests had been quashed, and pointed to the identification of asymptomatic patients during its two-week run in which 1.78 million residents were screened. The programme ended on Monday.Lam’s remarks were backed by Professor…