[Windows] Pinned PowerShell shortcuts are lost after upgrade. #6088

New issue at the request of Steve Lee (@SteveL-MSFT) in issue #6080

When upgrading between new versions of PowerShell any pinned Start Menu or Taskbar Icons are lost.
If you copy the shortcut from the Start Menu to anywhere else, such as the desktop, that icon also stops functioning following an upgrade.

I believe the reason for this is because the path changes to the pwsh.exe changes after the upgrade due to the version being part of the file path for the pwsh.exe file. E.G.

• C:\Program Files\PowerShell\6.0.0-beta.9\pwsh.exe
• C:\Program Files\PowerShell\6.0.0-rc.2\pwsh.exe
• C:\Program Files\PowerShell\6.0.0\pwsh.exe
• C:\Program Files\PowerShell\6.0.1\pwsh.exe

Ideally the version number folder should be removed or at least the pwsh.exe is moved into the PowerShell folder and the rest of the files remain in the version folder. Also, is there a real need to keep the version number found on the shortcut that's placed into the Start Menu?

Steps to reproduce

1. Uninstall PowerShell.
2. Install PowerShell 6.0.0.
3. Right click the 'PowerShell-6.0.0' shortcut and select 'Pin to Start' or/and 'Pin to taskbar'.
4. Run the PowerShell 6.0.1 installer to perform an upgrade.

Expected behavior

For the PowerShell icon to remain pinned and working after the upgrade.

Actual behavior

The one in the Start Menu disappears. The one on the taskbar turns to a white default file icon which when clicked (Windows 10)...

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Environment data

Name                           Value
----                           -----
PSVersion                      6.0.1
PSEdition                      Core
GitCommitId                    v6.0.1
OS                             Microsoft Windows 10.0.17083
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0