[New Nuget Runner] Validate that we preserve line endings in Nuget dependency updates

[Penguinwizzard]

What are you trying to accomplish?

This adds stronger testing around End-of-Line (EoL) preservation to the new RunWorker functionality, and adds a second-pass EoL normalization run that should correct any cases we miss in the future.

Anything you want to highlight for special attention from reviewers?

The existing tests are made into Theories that run with different line endings and validate that they're preserved across the dependency update process.

How will you know you've accomplished your goal?

This was implemented using TDD, although the tests passed before the functionality changes were done.

Checklist

• I have run the complete test suite to ensure all tests and linters pass.
• I have thoroughly tested my code changes to ensure they work as expected, including adding additional tests for new functionality.
• I have written clear and descriptive commit messages.
• I have provided a detailed description of the changes in the pull request, including the problem it addresses, how it fixes the problem, and any relevant details about the implementation.
• I have ensured that the code is well-documented and easy to understand.