Review single file debug support

[isidorn]

Review all the top debugging extensions and check if they support single file debugging and no folder debugging.
Provide guidance to those extensions that do not support it.

• Typescript Provide a smart run/debug command for loose files #124280
• Javascript
• Python
• C++ Simplify debug vscode-cpptools#8224
• C# Simplify debug dotnet/vscode-csharp#4795
• Java
• 🏃 PHP Support no folder debugging xdebug/vscode-php-debug#638
• 🏃 Kotlin Support no folder debugging fwcd/vscode-kotlin#75
• R
• Dart Better no folder debugging Dart-Code/Dart-Code#3576
• 🏃 Go debug: support no folder debugging golang/vscode-go#1802
• PowerShell
• 🏃 Ruby Support no folder debugging rubyide/vscode-ruby#771
• Lua Support no launch.json debugging actboy168/lua-debug#150
• 🏃 React native Support no launch.json debugging vscode-react-native#1675
• 🏃 Firefox Support no launch.json debugging firefox-devtools/vscode-firefox-debug#266
• ✋ Jest Support no launch.json debugging jest-community/vscode-jest#776
• Kubernetes Simplify debug  vscode-kubernetes-tools/vscode-kubernetes-tools#983

fyi @weinand @roblourens

[isidorn]

We have done the planned work and have contacted debug extension authors with recommendations.
The follow up work is captured in the linked issues.
Thus closing this one as done.