"you're out of credits" is not surfaced in the cloud github resolver

[neubig]

In the github resolver, when the user runs out of credits, they see this error:

In the server logs we see:

openai.BadRequestError: Error code: 400 - {'error': {'message': 'ExceededBudget: User=... over budget'}}

We need to surface this error in a more legible way.