Apply 'no-unnecessary-type-assertion' lint rule#22005
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A lot of type assertions have become unnecesary as we added stricter node types. This lint rule prevents us from writing
x as Tif the type ofxis already assignable toT.Required changing
no-unnecessary-type-assertionto ignorex!since we don't have--strictNullChecksyet -- made a pull request upstream at palantir/tslint#3724.Also switches us to using the
--projecttslint option. This increases lint time from about 13 to 19.5 seconds.