Add a test to document how 'task tree' cancellation happens. #3499
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This was inspired by #3497. We've known for a long time that cancelling a root effect will cancel its child effects too. We've investigate fixes for this, but sadly we do think it's just how things have to be right now. Fortunately we do have some changes coming to the library that will allow us to improve this behavior. But for the time being let's at least document this behavior in a test.