Use CKEditor 5 for example value in code editor formatted text prop

Overview

When #3519135: Evolve "Text area" prop type to "Formatted text" in code editor, make use of new prop shape with `contentMediaType: text/html`, ensure formatted text can render inside code components lands, we can take the experience to the next level by adding a CK5Editor widget over the example form element in the code editor.

Proposed resolution

Render CKEditor 5 over the following element:

User interface changes

CKEditor 5 appears over text area example value form element in code editor.