[babel 8] Remove `loose`/`spec` from `preset-env`, and `useESModules`

[nicolo-ribaudo]

Docs for https://github.com/babel/babel/pull/16141 and https://github.com/babel/babel/pull/16043

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[JLHwung]

Can you also update the migration docs?

[nicolo-ribaudo]

Done!