Update jQuery step two:

- 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.

git-svn-id: https://develop.svn.wordpress.org/trunk@49101 602fd350-edb4-49c9-b593-d223f7449a82

package.json

@@ -61,7 +61,6 @@
 		"grunt-webpack": "^3.1.3",
 		"ink-docstrap": "1.3.2",
 		"install-changed": "1.1.0",
-		"jquery-migrate": "1.4.1",
 		"matchdep": "~2.0.0",
 		"node-sass": "~4.14.1",
 		"prettier": "npm:wp-prettier@2.0.5",
@@ -137,7 +136,6 @@
 		"jquery-color": "https://github.com/jquery/jquery-color/archive/2.1.2.tar.gz",
 		"jquery-form": "4.2.1",
 		"jquery-hoverintent": "1.8.3",
-		"jquery-ui": "https://github.com/jquery/jquery-ui/archive/1.11.4.tar.gz",
 		"lodash": "4.17.19",
 		"masonry-layout": "4.2.2",
 		"moment": "2.27.0",