ci: Unit test pipeline fix with update

[AjitPadhi-Microsoft]

Purpose

• This pull request significantly increases the test coverage for the data pipeline, content processing, and file handling modules by adding comprehensive unit tests. It also improves the configuration for code coverage reporting and ensures that test coverage metrics are accurate and meaningful.

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• ...

Other Information