- Add jquery-migrate.js v.3.3.1 to core and load it in debug mode when `SCRIPT_DEBUG` is true.
- Add jquery.min.js, update jquery.js to 3.5.1 non-minified. This should help when debugging.
- Rebuild jQuery UI 1.12.1 and add it to core.
- Fix/adjust tests to match the above changes.
See #50564.
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git-svn-id: http://core.svn.wordpress.org/trunk@48863 1a063a9b-81f0-0310-95a4-ce76da25c4cd
