We've been doing it manually when the stalebot keeps coming back to
deep-sitting bugs that we'll pretty much never fix accidentally / in
passing, now we're automating it: the stalebot will lay off the bugs
that have already gone through the cycle of “reported — stalebot asks to
confirm — the users confirm” once.
This might need to be complemented with a yearly sweep of the `never
stale` issues as a sanity check, but first we just shed the manual work.

Release Notes:

- N/A