[Fresh] Retry failed roots on refresh (#15966)

* Retry failed roots on refresh

* Don't prevent retry after error -> render(null) special case

The check wasn't very resilient because in Concurrent Mode it looks like we can get further follow-up commits even if we captured an error. So we can't reliably distinguish the case where after an error you _manually_ rendered null.

Retrying on an edit after a tree failed _and_ you rendered null in the same tree seems fine. It's also very unlikely a pattern like this actually exists in the wild.