Remove `noUnusedLocals` option from `tsconfig.json` files. It's redundant, as Oxlint `no-unused-vars` covers this for us.
It's an annoyance to have `noUnusedLocals` enabled, as in VS Code TypeScript complains about unused vars, even if they're prefixed with `_`.
Removing this option allows simplifying type tests added in #20066. Only reason these types had to be exported was to stop TS complaining that they were unused.
I thought making it a separate would be easier to manage,
but it's actually not.
Previous setup was also downloading packages from npm on every CI run.
overlookmotel