[pipelines] Change summarization default to distilbart-cnn-12-6
- Also adds an integration test that runs on GPU if available.
- Other pipelines could do the same if that would be helpful.
CI Failure is spurious.<|||||>Could you please tell me in **distilbart-cnn-12-6** what does **12 & 6** stands for?<|||||>12 Encoder layers and 6 decoder layers I would suggest<|||||>Thank you Sir, @patrickvonplaten 