Preview: Redirect to published URL on exit #20556
                
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Description
Currently, when a user exits preview mode, they will be redirect to the frontend of the website with the page URL containing the previewed page's GUID/key. This PR updates the logic to use the page's published URL.
How to test?
When viewing a document in preview mode, press the "End" button and notice the destination of the redirected URL in the browser address bar. If the document has a published state, it will redirect to the published URL, if the document is draft/unpublished, then it will redirect to a 404 (not found) page.