Quiz: ability to retain the failed quiz attempts

This has been requested by a user in 6996014-zen: they would like to keep a history/track of all the students' quiz attempts, as currently the results (when failing) get reset upon re-taking the quiz:

I would really, really love for you to make it possible to see the failed tests as well. Disallowing retake is not an option, as I want them to learn. If I disallow retakes they never learn. If I can see the failed tests then I know what they need to practice more, and then I can really prove that my course is working. Now they might as well know it from beforehand when I look at their results. And then it's not a very good online course. So I would really, really ask you to consider this improvement, and tell me when you have thought about it and can tell me the result of the discussion and time frame.

Automattic / sensei

Quiz: ability to retain the failed quiz attempts #7191