RobotWebTools / rclnodejs / 20988470774 / 1

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Add tests to improve coverage (#1363)

### Summary
Enhanced unit test coverage for core library modules and simplified CI configuration.

### Details
*   **Test Coverage Improvements**:
    *   Added comprehensive unit tests for `utils.js`, `time_source.js`, `native_loader.js`, `timer.js`, `message_validation.js`, `message_serialization.js`, `client.js`, `event_handler.js`, and `logging.js`.
    *   Achieved >80% code coverage for these modules.
    *   Fixed compatibility issues for ROS 2 Humble (added conditional checks and mocks `stubOptional` for newer API features like `setOnResetCallback`).

*   **CI Configuration**:
    *   Updated `.github/workflows/linux-x64-build-and-test.yml` to remove the redundant `finish` job and `parallel` Coveralls upload, streamlining the process for single-job coverage reporting.

Fix: #1362

1382 of 1755 branches covered (78.75%)

Branch coverage included in aggregate %.

2861 of 3205 relevant lines covered (89.27%)

453.23 hits per line