Implement Product Deletion

[jocafernanro]

Create an API endpoint to delete an existing product from a wishlist.

• AC1. The endpoint accepts a DELETE request with a product's ID
• AC2. The endpoint correctly removes the product from the database.
• AC3. The endpoint returns a success message upon successful deletion.
• AC4. The endpoint returns an error if the given product's ID does not exist and it does not belong to the wishlist