Describe the bug
Test summary panel, shows incorrect test groups count after a few run
To Reproduce
Steps to reproduce the behavior:
- Go to Test Panel
- Click on Run or Debug buttons rapidly
Expected behavior
Test group count should not change
Screenshots

Versions (please complete the following information):
- VS Code version: 1.50.1
- Dart extension version: 3.16
- Dart/Flutter SDK version: 1.22.2