[b440295519] Add test coverage report to PRs

[vladislav-sidorovich]

Add test coverage reports to PRs for Dumper only for now.

Next steps:

1. apply to all the modules
2. add minimal test coverage as a mandatory check
3. publish with the releases

[github-actions]

Code Coverage Report

Overall Project	59.07%	🍏

There is no coverage information present for the Files changed

[kpiotrowski]

Can we add a badge with unit tests status & coverage to the readme?

[vladislav-sidorovich]

Can we add a badge with unit tests status & coverage to the readme?

I would prefer to improve coverage first, but yes, we can.

[vladislav-sidorovich]

Test report is published and can be find here https://github.com/google/dwh-migration-tools/actions/runs/17295980795