In c5bdf6c094, we started to show errors
when a subscription failed to renew because of a charge failure.
Now, we show additional text depending on what the charge failure was.
For example, if you had an invalid card number, we show a special string
for that.
Currently, when your subscription expires due a charge failure, we
incorrectly tell you that it's due to inactivity. This fixes that, by
telling you about the charge failure.
This is a bit difficult to test on its own, so I:
- Faked out the smallest pieces I could in an effort to test states
manually
- Created `BadgeErrorSheetState` which is pretty thoroughly tested
