Check if a pending inbound transaction Output is in the chain before cancelling

[philipr-za]

Currently we will cancel a pending transaction if it has not completed after 3 days. However for an inbound transaction it is possible that a problem resulted in the Sender publishing the transaction but the Finalized message not reaching us. So before we totally give up on the transaction we should check with a Base Node if our output happened to be mined.

Waiting for Base Node RPC to be completed.

Related to #2137

[stringhandler]

@philipr-za can this be closed?

[SWvheerden]

Closing this.
Although we don't do an explicit check here when we cancel a transaction, we can only really check for the single outputs we own. If we can communicate with the exact wallet that finalized the transaction, we cannot recreate the kernel fields etc.
We can scan for the output, but since: #4464, we scan each block for outputs anyway. If an output goes missing from an erroneously canceled transaction, the utxo scanner will pick it up and add it to the OMS.