chore: improve coverage

[filipecabaco]

What kind of change does this PR introduce?

improve coverage

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes
  • Improved error handling for database replication operations, including better handling of unavailable replication slots.
  • Enhanced robustness when managing database configuration in edge cases with missing or invalid settings.

Walkthrough

This pull request adds comprehensive error handling and test coverage to the Postgres CDC RLS extension. Two production code changes improve robustness: the db_settings function now safely handles nil configuration values by returning explicit nil defaults, and the terminate_backend function explicitly handles missing replication slots. The remaining changes consist entirely of new and expanded test modules covering extension configuration, database settings, replication operations, worker supervision, rate limiting, CDC RLS functionality, and latency monitoring. The test additions focus on validating error paths, retry logic, and edge cases across the extension's core components.

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