feat: adding support for Java25 tests to work properly in CI

[maigovannon]

Description

This is one of the changes from https://github.com/GoogleCloudPlatform/java-docs-samples/pull/10193

Checklist

• [x] I have followed Sample Format Guide
• [x] Please merge this PR for me once it is approved

[gemini-code-assist[bot]]

Summary of Changes

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This pull request introduces support for Java 25 within the continuous integration environment. By updating the CI script to acknowledge Java 25 as a valid target version, it ensures that projects configured to compile against Java 25 can be tested and validated without encountering version-related failures in the CI pipeline. This is a foundational step towards broader compatibility with newer Java releases.

Highlights

• CI Configuration: The .kokoro/tests/run_test_java.sh script has been updated to include Java 25 in the list of ALLOWED_VERSIONS. This change enables the CI system to properly recognize and validate projects targeting Java 25.

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