Return Insufficient balance message on payment failure

[brh28]

In the case of a payment failure due to a lack of funds, we should display an insufficient balance message, rather than a generic error message.

This Honeycomb trace shows a sample Ibex response and Graphql response.

As shown in the trace, Ibex responds with a 400 and error message

{"error":"insufficient balance. Current Balance: 5.000000. Estimated Fee: 0.001109. invoice amount: 5.042164. account: 39c6e986-979b-40ab-9e7b-df18a9277a84"}

We want to detect these errors and map to a more user friendly message