This is a restoration of [31749] which was reverted in [31755].
It includes a number of enhancements from the original version. Namely:
* Not doing a credential check in src/wp-includes/script-loader.php
* Add new function `wp_print_request_filesystem_credentials_modal`
* update the version number in the list table when a plugin is updated
UI still needs further work, but this basic version should enable more testing
Props ericlewis, jorbin
See #31528
Built from https://develop.svn.wordpress.org/trunk@31811
git-svn-id: http://core.svn.wordpress.org/trunk@31793 1a063a9b-81f0-0310-95a4-ce76da25c4cd