Log account migration information to Bugsnag
Log account migration information to Bugsnag

We’d like a record of account migrations so that it’s possible to
reconstruct what happens if something goes wrong. Bugsnag has the option
to do an `info`-level severity, which seems reasonably appropriate here,
and more appealing than storing the data in Firebase.

jwang1919/popcode,outoftime/learnpad,popcodeorg/popcode,popcodeorg/popcode,jwang1919/popcode,popcodeorg/popcode,popcodeorg/popcode,jwang1919/popcode,jwang1919/popcode,outoftime/learnpad