App should show error alert if protocol run errors out

[mcous]

overview

As a user, I would like to know if my protocol run fails for some reason. Blocked by #2994

current behavior

Currently, the app suppresses protocol run errors because "Cancel" (which triggers a smoothie halt) emits an error. This means that legitimate errors are also suppressed, so if the protocol run errors, the user can't really tell that the run errored (or even stopped).

steps to reproduce

1. Upload a protocol
2. Start a run
3. Trigger an error (smoothie limit switch?)
4. Observe that the app doesn't really do anything

expected behavior

If an error happens during a protocol run, the app should show the user an error.