Create eslint configuration for node scripts

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Currently we're applying our airbnb-based eslint config globally and adding non-babel-transformed modules into .eslintignore to bypass incompatibilities with node. However, this is probably overkill. Our node scripts would benefit from eslint as well, we just need to conditionally apply a different ruleset for babel modules and node modules.

This would be a similar approach to what we're doing with prettier in gitlab-ce!17967.