Allow case sensitive paths on Windows/macOS

[ghost]

• VSCode Version: 1.34.0-insider
• OS Version: Windows 10.0.17763

Steps to Reproduce:

1. In a terminal fsutil.exe file setCaseSensitiveInfo %somepath%
2. create two files with the same name, but different cases foo.txt and FOO.txt
3. browse to that %somepath% in vscode

Observations:
Seems to be limited to the folder tree widget, since find in files correctly lists the case sensitive filenames

Does this issue occur when all extensions are disabled?: Yes

[Tyriar]

File service related?

[bpasero]

VSCode today does not support file path case sensitivity on neither Windows nor macOS. Related: #48258

//cc @isidorn

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