Block Editor: Fix the WordPress packages and vendor script registration.

The version is set properly and the scripts are automatically loaded in the footer.

This patch also includes a revert for the reusable blocks enqueue script.

Props pento, swissspidy, youknowriad.

Merges [43942] into trunk.

Fixes #45402.
See #45396.
Built from https://develop.svn.wordpress.org/trunk@44277


git-svn-id: https://core.svn.wordpress.org/trunk@44107 1a063a9b-81f0-0310-95a4-ce76da25c4cd