Remove `wp-nux` CSS as dependency from `wp-edit-post` and `wp-editor`.

[peterwilsoncc]

The CSS for both wp-edit-post and wp-editor list the wp-nux CSS file as a dependency. This results in nux.css being loaded when using these packages.

Neither wp-edit-post or wp-editor use any of the styles included in nux.css so the dependency can be removed.

Related #57643.

A ​pull request exists for this. I'll see if I can get it to link to this ticket too.

[flixos90]

Thanks @peterwilsoncc, the change makes sense to me. Just wondering, is this really a bug? If it is, maybe we can still commit it for 6.2 Beta. But to me removing a dependency that's unused seems more like an enhancement, unless it was causing any actual bugs for the end user.

[peterwilsoncc]

Replying to flixos90:

Thanks @peterwilsoncc, the change makes sense to me. Just wondering, is this really a bug? If it is, maybe we can still commit it for 6.2 Beta.

I think it's one of those items that falls neatly between bug and enhancement. I lean toward the former but left the ticket in review for the release squad to decide if it's the latter.

I'm happy with whatever milestone you decide.

[peterwilsoncc]

In 55628:

Script Loader: Remove unused wp-nux CSS dependency.

Neither wp-edit-post nor wp-editor use the styles included in the wp-nux CSS file. This removes nux as a dependency from the registration of the two files.

Props flixos90, youknowriad, peterwilsoncc.
Fixes #57827.
See #57643.