Improve and modernize workaround for OpenSSH bug in SSH-Remoting-in-PowerShell.md

[dodexahedron]

Added an option that creates a symbolic link, for systems without 8.3 support and simplified the method to get the 8.3 name as a fallback.

See #12107 for details.

PR Summary

• Adds a pure powershell means of achieving the workaround using a symbolic link.

• Discourages use of the 8.3 short name path.

• Explains why 8.3 short names may not be optimal.

• Changes the command used to get the 8.3 short name to one that outputs the full path to pwsh.exe in 8.3 form.

• Resolves Enable-SSHRemoting bug workaround improvement/modernization - Favor symlink over 8.3 and improve 8.3 fallback command #12107

PR Checklist

• Descriptive Title: This PR's title is a synopsis of the changes it proposes.
• Summary: This PR's summary describes the scope and intent of the change.
• Contributor's Guide: I have read the [contributors guide][contrib].
• Style: This PR adheres to the [style guide][style].

This PR is ready to go unless other edits are needed.

[dodexahedron]

@microsoft-github-policy-service agree

[github-actions]

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[dodexahedron]

It's perhaps a bit wordy, but I figured I'd put all my thoughts down in the interest of completeness. 🤷‍♂️

It can be pared down if desired.

IMO, just nixing the 8.3 method altogether is probably ideal, but it's there and enhanced if it is preferred that it remain.

[learn-build-service-prod]

Learn Build status updates of commit 1e238e0:

✅ Validation status: passed

File	Status	Preview URL	Details
reference/docs-conceptual/security/remoting/SSH-Remoting-in-PowerShell.md	✅Succeeded	View (>=powershell-5.1)

For more details, please refer to the build report.

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[dodexahedron]

My thinking on replacing this command, specifically, was that the proposed command works no matter where it is installed, including non-standard paths. This only covers the case of it being installed in C:\Program Files, specifically. 🤷‍♂️