Test: debug progress events

[isidorn]

Refs: #92253

• any os @connor4312
• any os @mjbvz

Complexity: 4

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VS Code now shows debug progress events via silent progress notifications.
Have a debug extensions that implements Progress Events, or use and modify the Mock Debug Extension https://github.com/microsoft/vscode-mock-debug (progress event is started by typing progress in debug console after staring a debug session).

Verify:

• VS Code shows progress with a 500 ms timeout (motivation here Notifications: if finished before delay starts the notification still shows briefly #93029)
• VS Code shows an infinity blue spinner in the debug viewlet as long as there is an active progress event
• Have multiple progress events started simultaneously and make sure VS Code represents this correctly
• VS Code show a silent progress notification for each progress event
• If a progress event is cancellable make sure VS Code renders a Cancel button in the notification and pressing Cancel stops the progress
• Make sure the label of the debug extension is rendered as the source for the notification
• A progressUpdate event is respected (check that message gets updated)
• if the elapsed time between progressStart and progressEnd is shorter than 500 ms no progress is shown at all.
• Optional: check that progressUpdateEvent with percentage attribute is respected

[mjbvz]

Didn't see any issues in my testing on MacOS. Compound debugs with progress also worked great

[isidorn]

Thanks for testing it out 👏