PR Summary

This fixes a bug where a working directory path with a trailing back slash causes Start-Job to fail.

PR Context

Windows command line parsing will drop any trailing back slash in the argument list. The fix is to escape all back slash characters in the Start-Job working directory path, before including it in the argument list.

PR Checklist

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• Summarized changes
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• Breaking changes
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  • Experimental feature(s) needed
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• User-facing changes
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  • Documentation needed
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    • Impact on PowerShell Editor Services which is used in the PowerShell extension for VSCode (which runs in a different PS Host).
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