PR Summary

This changes fixes issue, #10537. It sets each parallel running script block context to have the same working directory location as the calling script.

PR Context

Previously, parallel running script blocks would use the default PowerShell working directory, similar to remoting and job execution. But ForEach-Object -Parallel should run all script in the same working directory as the calling script, to make it consistent with ForEach-Object while running in normal (non-parallel) mode.

PR Checklist

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• Breaking 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).
    • Impact on Completions (both in the console and in editors) - one of PowerShell's most powerful features.
    • Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
    • Impact on EditorSyntax (which provides syntax highlighting with in VSCode, GitHub, and many other editors).