Mac OS: When VS Code exits, dotnet started by Omnisharp keeps running and spikes up to 100% until manually closed

This has been an issue for years now.. I think we all know this one, right?

## Steps to reproduce

1. Be on a Mac, with visual studio code and omnisharp
2. Use code for a bit, do C# things
3. Close VS Code with CTRL+Q
4. Open Activity monitor

## Expected behavior
Dotnet instances should be cleaned up, or at least not spike to 100% cpu usage

## Actual behavior
Battery is draining faster than expected because 5 dotnet exe's are running at 100% cpu