fix: Fix directory_in_root integration test on Windows

[johnmerchant]

Description

This merge request resolves the failing directory_in_root integration test on Windows

Motivation and Context

The test was failing because /usr is an invalid path on Windows.

I have changed the directory_in_root test to have both a Windows and Unix version by using the #[cfg(target_os)] attribute.

Closes #97

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

cargo test on Windows

• I have tested using MacOS
• I have tested using Linux
• I have tested using Windows

Checklist:

• I have updated the documentation accordingly.
• I have updated the tests accordingly.

[matchai]

Ah, that explains it!
The same root directories aren't available in Windows 😅

Thank you for tackling this @jmercha! I'll be readding Windows test runs and releases to Azure Pipelines. 👍