Enable webpack nodeEnv optimization

Mike Greiling requested to merge fix-webpack-node-env into master

The webpack nodeEnv optimization was erroneously set to false due to an accidental commit prior to %10.8. This meant that webpack was neglecting to strip out code within if (process.env.NODE_ENV !== 'production') blocks that are generally used for debug code and verbose error messages. This amounts to a minor performance degradation because our frontend bundle sizes are slightly larger as a result.

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