fix(CodeEditor): only include pf-v6-c-code-editor__upload when hovering is active over an empty state

[nicolethoen]

What: Closes #11518

[patternfly-build]

Preview: https://patternfly-react-pr-11568.surge.sh

A11y report: https://patternfly-react-pr-11568-a11y.surge.sh

[logonoff]

Do we still want an dashed outline around the margins of the editor when a file is dragged on an in-use editor?

Somewhat like this:

[thatblindgeye]

@mcoker @andrew-ronaldson @nicolethoen re: the above comment.

I feel like that would make sense to retain the dashed border when you're dragging to upload something over a code editor that is already in use. We don't prevent that functionality so right now it would be a valid action, dragging a file to replace whatever content is already in the code editor.

Rather than removing the __upload element+the hidden input element in React, which seems vital for that styling, would we instead want to tweak the CSS in core to remove padding if __upload contains the pf-v6-c-code-editor__code element?

[nicolethoen]

ohp - I saw your comment after I pushed the fix to remove hover styles after initial upload.
FWIW, I think this works now a little more intuitively... WDYT, @thatblindgeye ?

[patternfly-build]

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Thanks for your contribution! 🎉