front: turn on @typescript-eslint/no-unnecessary-type-assertion lint #8785
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First part of #8772
Enable typed hinting so that ESLint has information about types
and can provide more feedback. Only enable a single typed lint
rule for now (rest will be a lot more work to fix).
The rule @typescript-eslint/no-unnecessary-type-assertion prevents
unnecessary type assertions (e.g. casting a string to a string).
Reducing type assertions is nice because type assertions override
type checking and thus may hide type mismatches.