Test: debugger refactoring to support launching DAs from EH

[weinand]

Test for #45129:

• windows: @roblourens
• anyos: @isidorn

Complexity: 4

Authors: @weinand

In this milestone we've refactored the VS Code debugger so that DAs can now alternatively launched from the EH in order to reduce the load of the renderer.

Because this refactoring has touched lots of code, we need to verify that the VS Code debugger and debug extensions continue to work as before.

Please note: running DAs in the EH will not be enabled in this milestone and testing the feature is not part of this test item. Make sure that you have turned off the corresponding setting.

Verify that existing debugger functionality was not broken by the refactoring, in particular:

• variable resolution in launch configs (workspaceFolder etc, env:xxx, config:xxx, command:xxx),
• platform specific sections in launch config (osx, windows, linux),
• debug console, integrated terminal, external terminal,
• debugging via the "debugPort" attribute,
• automatic restart behaviour (e.g. for nodemon),
• extension host debugging,
• auto attach and cluster feature

In addition:

• verify that some popular debuggers not built-into VS Code continue to work (e.g. Python, php, C#, C++)

[roblourens]

I'll just do this one tomorrow because it sounds like there were relevant changes made after the build. #43516 etc

[weinand]

@roblourens makes sense