Pro-Beijing lawmaker Chan Hoi-yan has been officially ousted from Hong Kong’s Legislative Council, after the city’s top court refused to let her challenge her disqualification, following a successful election petition by her opposition rival Lau Siu-lai.The Court of Final Appeal upheld the decision that Chan was not duly elected after polls officials unjustifiably invalidated Lau’s nomination in the 2018 by-election, triggered by the improper oath-taking of six opposition lawmakers.Ousted…