Disable published item copy button when editing slug

[martenson]

resolves #17884

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[davelopez]

Should we target 24.0 for the fix?
Disabling the button might also work.

[martenson]

@davelopez Sure, I'll backport it.

As of disabling I'd rather hide it to unclutter the interface in this case.

[assuntad23]

thanks @martenson !