@Override
            public void disposeTracer(final OperationTracer tracer) {
              // single-test mode doesn't need to track tracers
            }
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