[FW][FIX] website_slides: only allow for a single review per user #156411
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Once a user posts a review, they are able to edit this single review and not create any new ones. However if the user had multiple tabs open of the same course, then they can still access the "Add a review" functionality.
This fix enforces the single review per user per course policy.
Task-3721958
Forward-Port-Of: #156198
Forward-Port-Of: #153679