Support Free Desktop

### Describe the bug.

When attempting to install .NET runtime through the extension, it produces errors with messages that a manual install is required. In addition, the script provided at https://learn.microsoft.com/en-us/dotnet/core/install/linux-scripted-manual#scripted-install seems to install components correctly, but manually changing the path to their location does nothing (and is reverted when refreshing the window).

### Please attach log file(s) here if you have any.

Please attach the log file located at /home/james/.var/app/com.visualstudio.code/config/Code/logs/20260522T203903/window1/exthost/ms-dotnettools.vscode-dotnet-runtime/DotNetAcquisition-ms-dotnettools.vscode-dotnet-runtime-1779505937306.txt. Note that this file may contain personal data.

**Extension Version:** 3.0.2
**Error Message:** Automated installation for the distro Freedesktop SDK is not yet supported.
Please install the .NET SDK manually: https://dotnet.microsoft.com/download.
If you would like to contribute to the list of supported distros, please visit: https://github.com/dotnet/vscode-dotnet-runtime/blob/main/Documentation/adding-distros.md
**Error Stack:** Error: Automated installation for the distro Freedesktop SDK is not yet supported.
Please install the .NET SDK manually: https://dotnet.microsoft.com/download.
If you would like to contribute to the list of supported distros, please visit: https://github.com/dotnet/vscode-dotnet-runtime/blob/main/Documentation/adding-distros.md
at new t.IDistroDotnetSDKProvider (/home/anonymous/.var/app/com.visualstudio.code/data/vscode/extensions/ms-dotnettools.vscode-dotnet-runtime-3.0.2/dist/extension.js:2:74018)
at new u (/home/anonymous/.var/app/com.visualstudio.code/data/vscode/extensions/ms-dotnettools.vscode-dotnet-runtime-3.0.2/dist/extension.js:2:55242)
at t.LinuxVersionResolver.DistroProviderFactory (/home/anonymous/.var/app/com.visualstudio.code/data/vscode/extensions/ms-dotnettools.vscode-dotnet-runtime-3.0.2/dist/extension.js:2:113144)
at t.LinuxVersionResolver. (/home/anonymous/.var/app/com.visualstudio.code/data/vscode/extensions/ms-dotnettools.vscode-dotnet-runtime-3.0.2/dist/extension.js:2:111501)
at Generator.next ()
at s (/home/anonymous/.var/app/com.visualstudio.code/data/vscode/extensions/ms-dotnettools.vscode-dotnet-runtime-3.0.2/dist/extension.js:2:107604)

### Reproduction Steps

-Install C# Dev Kit in vscode
-Attempt to install .NET through vscode dotnet runtime

### Expected Behavior

.NET should install

### Exceptions & Errors (if any)

_No response_

### .NET Install Tool Version

3.0.2

### Your operating system? Please provide more detail, such as the version and or distro above.

Linux

### VS Code Version

_No response_