Add Sample and Run Tests in Google Action Workflow

Wouldn't it make sense to run ATF checks as part of the main GHA workflow?

1) Add sample app to ATF
2) Add ATF Checks in 1-3 espresso tests
3) Run Checks in Github Action Workflow

Benefits:
- More thoroughly tests the framework (right now we are just running `./gradlew build`
- Demonstrates use of how to add checks
- Also shows how to get ATF checks running with espresso in a "stable" manner on GHA with Standard Github Runners (macOS or Ubuntu)