Don't request write permissions for RemotePowerShellConfig.txt

[Tadas]

PR Summary

Change remoting config file (%windir%\System32\PowerShell\7.5.0\RemotePowerShellConfig.txt) reader to use an input stream instead of an input/output stream. This means that write access is no longer needed in this system directory.

PR Context

This should help with issues:
MicrosoftDocs/PowerShell-Docs#11682
PowerShell/PowerShell#18741
PowerShell/PowerShell#20180
PowerShell/PowerShell#14274
PowerShell/PowerShell#17367

Tip

For completeness sake, I will mention that if you change (Get-PSSessionConfiguration -Name <session_config_name>).Filename to point at the dll that is present in PowerShell's install location (e.g. "C:\Program Files\PowerShell\7\pwrshplugin.dll") it should work without write permissions, with the added benefit of always having this file auto-updated when a new version of PowerShell is installed.

Excellent write up in https://awakecoding.com/posts/enable-powershell-winrm-remoting-in-powershell-7/ shows the command to do that:

Set-Item -Path "WSMan:\localhost\Plugin\PowerShell.7\Filename" -Value $WSManPluginPath