Roadmap: In-Game Test Automation

[Kadino]

Summary:

Tools to simplify creating automated tests which execute inside the game engine, such as the deployable Game and Server executables.

What is the relevance of this feature?

Helps O3DE contributors write tests for in-game (in-engine) functionality, separate from the Editor. Helps teams using O3DE write tests for their own production code.

### Tasks
- [ ] https://github.com/o3de/sig-testing/issues/20
- [ ] https://github.com/o3de/sig-testing/pull/66
- [ ] (RFC followup work TBD)