chore: Add IT for positional parameter on higher precision timestamp field

[lqiu96]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @lqiu96, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a crucial integration test to verify the functionality of positional parameters with high-precision timestamp fields in BigQuery queries. This ensures the robustness and accuracy of timestamp handling within the client library. Concurrently, the existing test suite for high-precision timestamps has been refactored to enhance maintainability and improve test isolation, making the tests more reliable and easier to understand.

Highlights

• New Integration Test for Positional Parameters: A new integration test, queryPositionalParameter_highPrecisionTimestamp, has been added to validate the correct handling of positional parameters when querying BigQuery tables with high-precision timestamp fields. This ensures the client library accurately processes timestamp values with picosecond precision.
• Test Class Refactoring for Isolation and Readability: The ITHighPrecisionTimestamp test class has undergone refactoring. This includes changing class and method visibility from public to package-private, aligning with JUnit 5 best practices. Additionally, temporary table names are now dynamically generated using a new generateTempTableName(String prefix) helper method, improving test isolation and preventing naming conflicts across test runs.

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[gemini-code-assist]

Code Review

This pull request adds an integration test for using positional parameters with high-precision timestamp fields in BigQuery. It also includes several good refactorings, such as making test components package-private and improving the temporary table name generation to prevent collisions. My review includes suggestions to make the new test more robust by not relying on query result order and to improve readability by avoiding magic strings.

[jinseopkim0]

Please fix the lint CI failures.