feat: upgrade terser & enable parallel minification in wsl #7857
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Motivation
Continuation of #6732
We can now enable parallel minification in WSL since it has been fixed upstream. webpack-contrib/terser-webpack-plugin#138
I also upgraded the terser-webpack-plugin to v2 (major change). The breaking changes are compatible with react-scripts configuration.
See https://github.com/webpack-contrib/terser-webpack-plugin/releases/tag/v2.0.0