Instead of requiring the packages individually this commit changes it so the packages are used from the packages repository (gutenberg). This is a solution that makes updating the packages easier, as long as we don't have a monorepo to manage both WordPress & the JavaScript packages together.
Props youknowriad, gziolo, omarreiss, herregroen.
See #45145.
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- `grunt webpack:dev` now copies packages JS into `/src/wp-includes/js/dist`, and CSS into `/src/wp-includes/css/dist`.
- `grunt webpack:prod` does the same, but into `/build` instead of `/src`.
- `grunt build` now runs the `webpack:prod` task.
Props atimmer, pento.
Fixes#45119.
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