Simplify simultaneous debug C# and GdScript

[van800]

It is currently possible with the following steps:

1. Create a "GdScript Start and Debug" config. (In Godot C# project, GdScript Player run-configuration is not auto-generated)
2. Start debugging that config, make sure debugging works, stops at brakepoints
3. Attach C# debugger with "Attach to process", select the game process

I can confirm that this sequence works, but it is a bit complicated and attempts to do it differently would likely fail.