Check if we have all dependencies for a transaction as a first step on onNewTxRequest

[andreabadesso]

Currently, we only error if any dependency for a transaction during the sync mechanism is missing when we are updating the utxos as spent (the query will trigger an error because no utxos will be found)

We should do this verification before any query is executed so we don't have to rely on the rollback mechanism

We should also return a specific error message for this type of error so the daemon can handle it properly