This brings the JS packages up to date and is the first step that will allow us
to include the other block editor updates for WordPress 5.9:
FSE infrastrucutre, site editor and global styles.
Props noisysocks.
See #54337.
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Move the cleaning of the `wp-includes/css/dist` folder from `clean:css` to `clean:webpack-assets` to avoid an order of operations issue in which the files were built shortly before been deleted later in the build process.
Follow up to [51689].
Props netweb, ramonopoly, peterwilsoncc.
Fixes#53719.
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