Future enhancements to automated testing

[ariel-phet]

After chipper 2.0 and some other work settles it would be good to discuss and prioritize some enhancements to automated testing.

I will bring this issue up at dev meeting for further discussion, but currently marking deferred.

A few comments already brought up:

SR: It would be great to easily be able to run all tests locally (including fuzz tests and unit tests)
AP: screenshot snapshot comparison
AP: keyboard-navigation fuzz testing
CM: list of shas for some column in CT report
SR: instructions for how to reproduce a failed test locally

seems also somewhat related to #15

[ariel-phet]

This is now a bit of a duplicate of #88 - closing.