PR Summary

This PR removes an unneeded SSH remoting .NET std stream workaround. Issue #15229.

PR Context

In the early days .NET stream reader/writer did not correctly handle std streams on Windows plaforms only, and we had a PInvoke workaround. This workaround is no longer needed and can be removed. This change also disables the ability for Console APIs to write to stdout, which is reserved for PSRP messages only.

PR Checklist

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