Add find.exe to legacy native command arg passing behavior for Windows

[JamesWTruher]

Addresses #15261.
Add tests.

PR Summary

In response to Issue #15261 and is a part of the NativeCommandArgumentPassing experimental feature.
The feature doesn't actually break --% as the argument list is created correctly when --% is present. However,
find.exe has some very specific behavior which is problematic when using the ArgumentList code path.

#15261 has more details.

PR Context

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[daxian-dbw]

LGTM

[ghost]

🎉v7.3.0-preview.7 has been released which incorporates this pull request.:tada:

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