feat(yaml): Modernize PostgreSQL to BigQuery template with YAML

[ihebimad]

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[gemini-code-assist]

Summary of Changes

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This pull request introduces a new YAML-based Dataflow template designed to streamline the migration of data from PostgreSQL to BigQuery. By utilizing the YAML template format, this change simplifies pipeline configuration and deployment, while ensuring robust validation and testing through the inclusion of a dedicated integration test suite.

Highlights

• New YAML Template: Added a new YAML-based Dataflow template for the PostgreSQL to BigQuery migration pipeline.
• Configuration and Metadata: Implemented the Java interface and YAML configuration file to define template parameters and pipeline structure.
• Integration Testing: Added a comprehensive integration test suite to verify the pipeline functionality using real PostgreSQL and BigQuery resources.

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[gemini-code-assist]

Code Review

This pull request introduces a new PostgreSQL to BigQuery batch pipeline template using YAML, including its documentation, Java parameter interface, YAML pipeline definition, and integration tests. The review feedback highlights several YAML syntax issues in PostgreSQLToBigQuery.yaml that need correction, such as formatting filesToCopy and requirements as standard YAML sequences rather than flow mappings, and enclosing Jinja placeholders in double quotes to avoid parsing errors. Additionally, there is a minor formatting issue with an unmatched backtick in the table parameter's help text within PostgreSQLToBigQueryYaml.java.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.01%. Comparing base (eb4a54f) to head (1fcd7e3).
⚠️ Report is 37 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (eb4a54f) and HEAD (1fcd7e3). Click for more details.

HEAD has 33 uploads less than BASE

Flag	BASE (eb4a54f)	HEAD (1fcd7e3)
	34	1

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #4145       +/-   ##
=============================================
- Coverage     56.37%   38.01%   -18.36%     
+ Complexity     7401      511     -6890     
=============================================
  Files          1125      195      -930     
  Lines         68795    11761    -57034     
  Branches       7783     1181     -6602     
=============================================
- Hits          38782     4471    -34311     
+ Misses        27535     6924    -20611     
+ Partials       2478      366     -2112     

Components	Coverage Δ
spanner-templates	∅ <ø> (∅)
spanner-import-export	∅ <ø> (∅)
spanner-live-forward-migration	∅ <ø> (∅)
spanner-live-reverse-replication	∅ <ø> (∅)
spanner-bulk-migration	∅ <ø> (∅)
gcs-spanner-dv	∅ <ø> (∅)
see 956 files with indirect coverage changes

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