Warn on unused ESLint disable directives in base
config
#829
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We already suggested this in the README, but we can actually ensure it's enabled for everybody in our shared configs.
Note that it is only possible to warn with this feature (erroring not possible yet, although I've written an RFC regarding this: eslint/rfcs#100).
https://eslint.org/docs/latest/user-guide/configuring/rules#report-unused-eslint-disable-comments