[do not land] handle runtime shutdown more gracefully #6875
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In #6505 we identified a situation where panics were occurring because the
Tokio runtime was shutting down. Making panics work better requires essentially
making all of the database code and its dependents be aware of the situation
where runtime shutdown is happening.
This is incomplete work that builds on top of oxidecomputer/async-bb8-diesel#77,
but I wanted to show the general direction we would
take here. The next step from here would probably be to detect the runtime
shutdown situation in background tasks, and change
BackgroundTask::activate
to cleanly exit in those situations.
I don't think this is worth pursuing to be honest -- I'd consider this an
interesting experiment but ultimately a negative result.