chore(bigquery-jdbc): update integration tests to handle different cancellation

[logachev]

Due to 64cde7f now jobs.query API is used even if we request job creation (Previously it falls back to jobs.insert). Due to this, updating integration test with new error/timeout values.

[gemini-code-assist]

Code Review

This pull request updates integration tests for the BigQuery JDBC driver. In ITNightlyBigQueryTest, the sleep duration before cancellation is increased to 15 seconds to ensure the job is in the appropriate state, and a debug print statement is added. In ITStatementTest, the expected exception message for a timed-out query is updated. Feedback suggests removing the leftover System.out.println debugging statement and refactoring the try-catch block in ITStatementTest to use assertThrows to ensure the test fails if no exception is thrown.