Add JVM --add-opens flags for Spark load tests on Java 21

[aIbrahiim]

Fixes: #39301, Fixes #39299, Fixes #39298, Fixes #39300

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[gemini-code-assist]

Summary of Changes

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This pull request updates the Spark runner load test configuration to ensure compatibility with newer Java versions (17+). By conditionally adding required module-opening flags, it prevents potential runtime access errors when running tests on modern JDKs.

Highlights

• JVM Compatibility: Added necessary --add-opens JVM flags to support Java 17 and higher environments.
• Gradle Configuration: Introduced a helper function sparkJvmArgs() in the load-tests build script to dynamically inject required JVM arguments based on the target Java version.

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[gemini-code-assist]

Code Review

This pull request introduces a sparkJvmArgs() helper function in sdks/java/testing/load-tests/build.gradle to conditionally append --add-opens JVM arguments when running Spark load tests on Java 17 or higher. The reviewer suggested a robust improvement to use Gradle's built-in JavaVersion.toVersion() helper instead of manually parsing the Java version string or integer.

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[gemini-code-assist]

Instead of manually parsing the Java version string/integer, you can use Gradle's built-in JavaVersion.toVersion() helper. This is more robust and handles various Java version formats (e.g., "17", "1.8", etc.) gracefully.

  def testJavaVer = JavaVersion.toVersion(project.findProperty('testJavaVersion') ?: JavaVersion.current())
  if (testJavaVer >= JavaVersion.VERSION_17) {