[Java][FlightRPC] Update benchmark to be on par with C++

See https://github.com/apache/arrow/issues/13980

The Java benchmark isn't comparable out of the box (and it seems like there's an unexplained gap between it and the C++ benchmark)

**Reporter**: [David Li](https://issues.apache.org/jira/browse/ARROW-17537) / @lidavidm

_{**Note**: *This issue was originally created as [ARROW-17537](https://issues.apache.org/jira/browse/ARROW-17537). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*}

首先閱讀連結的 Apache Arrow issue 13980，並將 Java FlightRPC 基準測試與其 C++ 對應版本進行比較。找出這些基準測試無法比較的原因，以及造成所回報效能差距的原因。完成標準是 Java 基準測試與 C++ 基準測試保持一致，並產生可比較的結果。

由索引模型根據 Issue 內容生成。