Implement automated notebook testing

[dhawalkp]

As more and more users are using HuggingFace along with Amazon SageMaker, we are seeing a need to make sure the example notebooks available in this repo are working correctly and intercept any bugs if any pro-actively so that we can identify them before the end users starts experiencing the problems. We need an automated mechanism to regression test these notebooks by periodically executing all the notebooks and report if there are any errors. The errors should create a new issue to be resolved.
This issue is to capture discussion around the practicality of implementing automated testing on this repository. Any thoughts would be greatly appreciated!
@philschmid - If you like to discuss more on this topic.

[philschmid]

@dhawalkp is there a way to automated tests for SageMaker Notebook Instances or Studio? Currently, all the sample notebooks only work on either Amazon SageMaker Notebook Instances or in SageMaker Studio.