Implement VS Code support for dynamic debug configs

[weinand]

please see #88230 for the detailed discussion.

[isidorn]

VS Code now supports dynamic debug configs. Thus closing this.
Here's a test plan item placeholder #95837
Here are my related comments from the other issue

Pushed an initial version of this for the "Select and Start Debug" action. Gif attached.
Note the following:

• As agreed we show each dynamic configuration provider once user chooses it we fetch the configurations for that provider (for multi root workspace we call provide for every root)
• We pass the cancelation token, so if the user cancles a long running quick pick the cancelation should be passed to the debug adapter
• group names: first is "launch.json", second is "contributed". That was more clear to me than "configured" and "contributed" as tasks does

I will now look into adding this into the debug dropdown.
Try it out and let me know what you think.

I have pushed support to also show dynamic providers in the debug dropdown.
For now I decded to use the "LABEL..." as the label. The ... at the end to make it distinguishable and that the user is aware that an additional dialog will follow. Also there is a separator.
Note that I do not use a separator between the launch configurations and a

Try it out and let me know how it behaves for you.
Since we have done what we planned for this item I am closing this.
For pinning launch configurations and other ideas we have discussed here please open follow up feature requests.
I plan to make a test plan item for this issue

[weinand]

@isidorn to make the new folder-like entries in the quick pick really stand out, we should use either the folder icon that task is using or the new debug icon we are using for sessions in the call stack view.

[isidorn]

@weinand makes sense. Pushed a change

[weinand]

Nice!

I noticed that you've added an ellipsis too (which IMO makes sense).
@alexr00 you might want to consider this too...

[isidorn]

@weinand yeah, I pinged also @alexr00 for that, but since they mostly show more of those items she thought it looks a bit like clutter.