Fix: Changing the permalink before publishing a product results in "not found" #3748
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Issue
Closes #3858
If the permalink of a product is changed, but not published yet, the permalink is assembled with the new (yet unpublished) handle, which leads to the PDP rendering a "Not found" template.

See this animated gif:
What it does:
URL to PDP.
What is does not:
(which I don't know what these are exactly) AFTER publishing a product. This is a separate issue: Sometimes after publishing a product, the product is "not found" #2249
Solution
If a product has unpublished changes, they published state is in
products.__published. Use that for building the perma-link from
products.__published.handle.
Impact: major
Type: bugfix
Breaking changes
not known
Testing