Prefer keys old enough to have propagated #54309
Merged
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The code for choosing a fallback key when no default was found sensibly distinguished between keys that were old enough to have propagated to all instances and those that were not. The code for choosing the preferred key should do the same.
This should help in the case where two instances both discover that a new key is needed and create an immediately-activated key. One of them will get both keys back from the repository and it should choose the older of the two to match the choice of of the other instance (which only knows about its own key).
Part of #52678