Restore: Sync Gutenberg @ b79bbe25a1b00ce640bfab363f182c678181082f

See changelog in 22294af4ed3b46f577f42590ba4cc19ca0a93f3f

> Build: Update Gutenberg integration to checkout-and-build approach.
> This changes WordPress Core's Gutenberg integration from npm packages to checking out and building Gutenberg directly. Instead of syncing individual npm packages, Core now checks out the Gutenberg repository, builds it, and copies the build artifacts.
>
> This enables Core to use Gutenberg's advanced features like route-based navigation, full-page rendering, and the Font Library, while also streamlining future updates.

git-svn-id: https://develop.svn.wordpress.org/branches/fixes-64393-restore-version-history@62118 602fd350-edb4-49c9-b593-d223f7449a82