Fix test resources in Xcode when running in symlinked directory

[dfabulich]

Fixes skiptools/skip#622

/tmp on macOS is a symlink to /private/tmp. We need to canonicalize both paths with (path as NSString).standardizingPath before we call .hasPrefix on them.

Skip Pull Request Checklist:

• REQUIRED: I have signed the Contributor Agreement
• REQUIRED: I have tested my change locally with swift test
• OPTIONAL: I have tested my change on an iOS simulator or device
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• AI was used to generate or assist with generating this PR. Please specify below how you used AI to help you, and what steps you have taken to manually verify the changes.

I used Cursor to automatically add logging statements. It found the path mismatch and fixed it, and I reviewed the result (all six lines).

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[marcprux]

Looks good, thanks!