Tests from scenarios - testing suite tooling

[wende]

• Tests are now defined as a parameterized list (an array of tuples with inputs, expected outputs, and options), allowing for easy addition of new cases and ensuring broader coverage across different input/output combinations (e.g., file → file, file → webrtc, file → whip, etc.).
• This reduces code duplication and makes the test suite more maintainable and readable.
• Allows for more tests to be added without unnecessary boilerplate
• The new tests leverage the new Boombox.async/2 API, which improves how async flows (like streaming protocols or chained pipelines) are tested.