Print more diagnostic information

I see this today:

```bash
ms-dotnettools.csharp tried to install .NET 9.0.2~arm64 but that install had already been requested. No downloads or changes were made.
ms-dotnettools.csharp requested to download the .NET Runtime.
Downloading .NET version(s) 9.0.2~arm64 ............ Done!
.NET 9.0.2~arm64 executable path: c:\Users\rlander\AppData\Roaming\Code - Insiders\User\globalStorage\ms-dotnettools.vscode-dotnet-runtime\.dotnet\9.0.2~arm64\dotnet.exe
```

Please consider:

- Report all files downloaded (including JSON and scripts)
- Report times for each
- Report total download time

This information would make it much easier to share bad download time diagnostics with us. We could even include an email address and/or issue for them to report long download times.

This would also be more informative for us as the team building this experience. It's often easy for us to ignore problems that are not "in our face".