By Tom Hals and Hyunjoo Jin (Reuters) -The judge overseeing Twitter Inc’s $44 billion lawsuit against Elon Musk has a no-nonsense reputation as well as the distinction of being one of the few jurists who has ever ordered a reluctant buyer to close a U.S. corporate merger. Kathaleen McCormick took over the role of chancellor or chief judge of the Court of Chancery last year, the first woman in that role. On Wednesday, she was assigned the Twitter lawsuit which seeks to force Musk to complete his deal for the social media platform, which promises to be one of the biggest legal showdowns in years…