test: add integration test for PostgreSQL source in Datastream to BigQuery

[yonatandt]

No description provided.

[gemini-code-assist]

Summary of Changes

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This pull request expands the integration testing suite for the Datastream to BigQuery template by adding support for PostgreSQL. The changes include necessary dependency updates and refactoring of the test logic to accommodate PostgreSQL-specific resource management and source initialization, ensuring robust validation of the pipeline across multiple database sources.

Highlights

• Integration Test Expansion: Added a new integration test case to verify the Datastream to BigQuery pipeline with a PostgreSQL source.
• Dependency Management: Included the PostgreSQL JDBC driver in the project dependencies to support the new integration test.
• Code Refactoring: Updated the integration test infrastructure to use Java switch expressions for cleaner resource management and source configuration across different database types.

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[gemini-code-assist]

Code Review

This pull request adds support for PostgreSQL integration testing in the Datastream to BigQuery template. This includes adding the PostgreSQL JDBC driver dependency, introducing a new integration test testDataStreamPostgresToBigQuery, and refactoring the test setup to support PostgreSQL using switch expressions. Feedback is provided regarding a potential issue with table name casing in PostgreSQL: unquoted table names are folded to lowercase, which will cause mismatches with case-sensitive BigQuery table IDs. A suggestion is provided to use lowercase table names when running tests with PostgreSQL.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.68%. Comparing base (2d76a99) to head (3516392).
⚠️ Report is 20 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4039      +/-   ##
============================================
- Coverage     55.70%   55.68%   -0.02%     
- Complexity     6774     7234     +460     
============================================
  Files          1125     1124       -1     
  Lines         68437    68447      +10     
  Branches       7719     7721       +2     
============================================
- Hits          38121    38114       -7     
- Misses        27844    27856      +12     
- Partials       2472     2477       +5     

Components	Coverage Δ
spanner-templates	87.66% <ø> (-0.02%)	⬇️
spanner-import-export	68.56% <ø> (-0.16%)	⬇️
spanner-live-forward-migration	89.27% <ø> (-0.02%)	⬇️
spanner-live-reverse-replication	83.45% <ø> (-0.02%)	⬇️
spanner-bulk-migration	92.47% <ø> (-0.03%)	⬇️
gcs-spanner-dv	88.53% <ø> (-0.02%)	⬇️
see 26 files with indirect coverage changes

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