itest: add <354 sats payment coverage for custom channels #874
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Description
This PR adds coverage for the scenario where an asset invoice worth less than 354 sats is paid for with sats (from a node that is not the RFQ peer).
This case triggers a specific code check in lnd where the incoming/outgoing sats produce a negative fee
(see related issue)
The current expected status of the payment is set to
lnrpc.PAYMENT_FAILED
as this has not yet been patched.This itest will be updated in order to expect a
lnrpc.PAYMENT_SUCCEEDED
once this behavior is fixed in lnd(see related PR for tracking)