Clean up out-of-date versions in a vscode storage

Older versions aren't cleaned up upon updates and consume space:

```bash
$ pwd
$ du -hc -d 1
/home//.config/Code/User/globalStorage/ms-dotnettools.vscode-dotnet-runtime/.dotnet
68M ./6.0.5
68M ./6.0.6
68M ./6.0.7
68M ./6.0.8
272M .
272M total
```
## Related issue
This is also related to a WorkSpace mess created by VSCode: , see related issue https://github.com/microsoft/vscode/issues/32461