Support different runtime environments out-of-the-box.

[YoEight]

Changed: Support different runtime environments out-of-the-box. Changed: Remove expectation oriented tests.

For the dispatch action you can provide the environment you want to test so if you chose staging, GHA will pull the right image from the staging docker repo.

[josephcummings]

Need to update the branch protection rules as the CI check names have differed and meant previous required checks are under a different name OR no longer exist: