vscode remote: Interpolate environment variable to build editor link scheme?

I am using Visual Studio Code under WSL remote. To build the URL for the editor link scheme I need to access an environment variable for the current distro being used. This works as an initializer, but I was hoping to contribute a patch to the `KNOWN_EDITORS`.

```
if defined?(BetterErrors)
BetterErrors.editor = "vscode://vscode-remote/wsl+#{ENV['WSL_DISTRO_NAME']}%{file_unencoded}:%{line}"
end
```

Discussion on SO for building the URL path for VS code remote: https://stackoverflow.com/questions/66582696/url-for-opening-vscode-in-file-in-wsl-workspace?noredirect=1#comment124115062_66582696