This is a shortcut fix. Instead of replicating the zip244 transaction
logic that's implemented in librustzcash:
zcash_primitives/src/transaction/components/orchard.rs
cheat by calling getblock with verbose level 1, which prints the txid
of each transaction. This currently requires calling getblock twice,
once for the raw hex (as we have always done), and again to get the
transaction IDs. An easy improvement would be to add the raw hex to
verbosity 1 result. (Or have a new verbosity that shows both.)
dfac02093d