@Override
            public OperationTracer getManagedTracer(final int txIndex, final Hash txHash) {
              return OperationTracer.NO_TRACING;
            }
Constructor for the T8nSubCommand class with a parent command. This constructor is required by
PicoCLI.

@param parentCommand The parent command for this sub command.
ethereum/evmtool/src/main/java/org/hyperledger/besu/evmtool/T8nSubCommand.java