ci: create workflow for Spanner failure injection tests

[darshan-sj]

This PR creates Spanner failure injection tests CI/CD workflow. It includes formatting improvements for readability for the CDC correctness test files and updates the Maven profiles used for running these tests to ensure they are properly isolated and executed.

This workflow will be used for Failure injection tests scheduled runs as well as nightly CDC correctness test runs.

[gemini-code-assist]

Summary of Changes

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This pull request introduces infrastructure to support automated failure injection testing for Spanner-related Dataflow templates. By adding a dedicated CI workflow and Maven profile, it enables rigorous testing of pipeline resilience against simulated transaction timeouts and network instability, ensuring data consistency and successful retries during adverse conditions.

Highlights

• New CI Workflow: Added a new CI workflow command 'run-failure-injection-tests' to automate Spanner failure injection testing.
• Maven Profile Integration: Introduced a new 'failureInjectionTest' Maven profile in pom.xml to configure surefire plugins for Fault Tolerance (FT) tests.
• FT Test Enhancements: Updated DataStreamToSpannerCDCFT and SpannerToSrcDBMySQLCDCFT tests with detailed documentation and improved setup procedures to better simulate transaction timeouts and verify pipeline robustness.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/spanner-failure-injection-tests.yml

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[gemini-code-assist]

Code Review

This pull request implements a failure injection testing framework by adding a Go-based test runner, a specific Maven profile, and improved documentation for fault tolerance tests. The reviewer identified a redundant flag call in the Go runner and recommended replacing 10-minute hardcoded sleeps in the integration tests with more efficient polling mechanisms to optimize CI execution time.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 53.16%. Comparing base (d31570b) to head (c401716).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3763      +/-   ##
============================================
+ Coverage     53.07%   53.16%   +0.08%     
- Complexity     6021     6497     +476     
============================================
  Files          1070     1075       +5     
  Lines         64941    65263     +322     
  Branches       7193     7235      +42     
============================================
+ Hits          34467    34696     +229     
- Misses        28163    28240      +77     
- Partials       2311     2327      +16     

Components	Coverage Δ
spanner-templates	72.82% <ø> (-0.05%)	⬇️
spanner-import-export	68.64% <ø> (-0.03%)	⬇️
spanner-live-forward-migration	80.94% <ø> (-0.06%)	⬇️
spanner-live-reverse-replication	77.06% <ø> (-0.15%)	⬇️
spanner-bulk-migration	91.11% <ø> (-0.04%)	⬇️
gcs-spanner-dv	85.76% <ø> (-0.07%)	⬇️
see 21 files with indirect coverage changes

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