Don't transform all modules to commonjs

[juliusknorr]

Enforcing modules transformation to commonjs does block webpack from using code splitting.

From https://babeljs.io/docs/en/babel-preset-env:

Setting this to false will preserve ES modules. Use this only if you intend to ship native ES Modules to browsers. If you are using a bundler with Babel, the default modules: "auto" is always preferred.
modules: "auto"

By default @babel/preset-env uses caller data to determine whether ES modules and module features (e.g. import()) should be transformed. Generally caller data will be specified in the bundler plugins (e.g. babel-loader, @rollup/plugin-babel) and thus it is not recommended to pass caller data yourself -- The passed caller may overwrite the one from bundler plugins and in the future you may get suboptimal results if bundlers supports new module features.

Encountered in nextcloud/text#1659 where the dynamic imports with a /* webpackChunkName */ comment no longer created chunks with the shared configs, when testing i also noticed that this is the case for the contacts app where the moment chunks are no longer built.

@skjnldsv Was there any specific reason this was explicitly set to commonjs?

[skjnldsv]

@skjnldsv Was there any specific reason this was explicitly set to commonjs?

I honestly forgot, that was needed by some other apps iirc.
Like talk 🤔

[skjnldsv]

Should be a major then 🚀