[Feature Request]: Colab notebooks automated Integration Tests

### What would you like to happen?

Colab Notebook tutorials are now being added into the Apache Beam Repo to provide for additional training materials. ([example](https://colab.sandbox.google.com/github/liferoad/beam/blob/windowing/examples/notebooks/get-started/learn_beam_windowing_by_doing.ipynb))

We should have an automated integration test that makes sure that the code in these notebooks run fine, and without errors as future versions of Beam are released.

### Issue Priority

Priority: 3 (nice-to-have improvement)

### Issue Components

- [X] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [X] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner