EPIC: Knuu e2e tests

[evan-forbes]

As the we are all preparing to switch to a common e2e test framework, we will need to flesh out the core/app portion. This portion needs to be able to act not only as an e2e test for core/app, but also as a foundation for repos built ontop of the celestia blockchain such as light clients and rollups.

This core/app portion of the framework will mainly be focused on regression testing and not correctness. For example, we will eventually want to test all things relating to single binary syncs/upgrades #2033, malicious block production, and fuzzing for non-determinism.

• ci: add nightly e2e test workflow #2370
• feat: use knuu for PoC e2e test #1914
• Version compatibility testing #313
• Non-determinism unit test #2414