cubicweb-vcreview #3120047 Add a direct link to the "accept" transition [open]

Now that we can read the diff directly in our email, it would be super efficient to have a link to the "accept" transition (https please cf,

This way one reads the diff in email, clicks the links and accepts the patch instead of having to click the link, click state, click accept, etc.

done in<not specified>
closed by<not specified>