GoQuorum private tx use zero gas (mining) (hyperledger#1924)

* set gas used to zero for goQuorum private tx

Signed-off-by: Sally MacFarlane <sally.macfarlane@consensys.net>

Co-authored-by: mark-terry <36909937+mark-terry@users.noreply.github.com>

ethereum/blockcreation/src/main/java/org/hyperledger/besu/ethereum/blockcreation/BlockTransactionSelector.java

@@ -247,7 +247,11 @@ Responsible for updating the state maintained between transaction validation (i.
    */
   private void updateTransactionResultTracking(
       final Transaction transaction, final TransactionProcessingResult result) {
-    final long gasUsedByTransaction = transaction.getGasLimit() - result.getGasRemaining();
+    final long gasUsedByTransaction =
+        transaction.isGoQuorumPrivateTransaction()
+            ? 0
+            : transaction.getGasLimit() - result.getGasRemaining();
+
     final long cumulativeGasUsed;
     if (ExperimentalEIPs.eip1559Enabled && eip1559.isPresent()) {
       cumulativeGasUsed =
@@ -285,7 +289,7 @@ private boolean transactionTooLargeForBlock(
         default:
           throw new IllegalStateException(
               String.format(
-                  "Developer error. Supported transaction type %s deoesn't have a block gas budget calculator",
+                  "Developer error. Supported transaction type %s doesn't have a block gas budget calculator",
                   transaction.getType()));
       }
     } else {