Fix stale vscode-local runtimes appearing in Uninstall .NET UI after directory deletion#2579

Copilot wants to merge 3 commits intomaindotnet/vscode-dotnet-runtime:mainfrom

copilot/fix-uninstalled-runtime-issuedotnet/vscode-dotnet-runtime:copilot/fix-uninstalled-runtime-issueCopy head branch name to clipboard