Media: Register the wp-media-utils style handle.

[t-hamano]

Before

After

Note that the layout of the Author field has been corrected.

Trac ticket: https://core.trac.wordpress.org/ticket/65794

Use of AI Tools

Used for: Initial code skeleton and test suggestions; final implementation and tests were reviewed and edited by me.

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[softglazee]

I tested this branch locally at commit 489b105139. The wp-media-utils-css stylesheet is now correctly registered and enqueued on both post-new.php and site-editor.php. The Network tab confirms the file returns a 200 OK status.

[andrewserong]

Good catch, thank you for fixing this! Also a good one for us to keep in mind if/when we ever roll out the media cropper to other screens in future releases.