Update the media upload interfaces to match new admin design:

* Replace separate progress bar designs on media-new.php and modal media uploader with a single consistent design
* Remove side borders from list of uploads on media-new.php
* Restyle the selected photo border and checkbox on modal media uploader
* Add a Media Uploader section to color schemes with progress bar and selected photo styles

Fixes #26147. Props melchoyce, iammattthomas.


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