We have a method called `fetchDevicesWithVerification` which is currently used
in the new Session manager. Let's use it for the (old) Devices Panel too,
because it allows us to check the device verification upfront, rather than on
the fly, which is going to be handy when that operation becomes async

these are in an async method, but currently use `some`. We need to invent an
`asyncSome` (we already have an `asyncEvery`) and use that

... which means making it async

This is ok except we need an "unmounted" guard because it's an old-style
componment