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GH-43394: [Java][Benchmarking] Fix Java benchmarks for Java 17+ (#43395)

### Rationale for this change

Now that Arrow Java has moved from Java 8 -> Java 11, we need to add `--add-opens` when running Java.

### What changes are included in this PR?

* Add `--add-opens=java.base/java.nio=org.apache.arrow.memory.core,ALL-UNNAMED` to `_JAVA_OPTIONS` in archery.
* Clean up test code only used for Java 8

### Are these changes tested?

To be verified via CI and ursabot.

### Are there any user-facing changes?

No
* GitHub Issue: #43394

Authored-by: Dane Pitkin <dpitkin@apache.org>
Signed-off-by: Dane Pitkin <dpitkin@apache.org>