PR Summary

Remove unnecessary path split inFileSystemProvider.CreateDirectory because those parts are not used anywhere and ultimately end up being combined again for theDirectory.CreateDirectory call.

PR Context

Fixespester/Pester#2258 :

When invoking the New-Item cmdlet with a path of TestDrive:\ -Force during a test, a new folder in the current working directory with the name of the guid of the TestDrive: provider is created.

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