[vanshhh18]

Summary

• Quote fully qualified BigQuery table names with backticks in _feature_to_data_source.
• Add a regression test for project IDs containing hyphens, such as my-proj-5bb0.
• Preserve existing test cases.

Testing

• Python syntax validation passed.
• git diff --check passed.
• Focused unit test could not be completed because of missing dependencies in the local environment.