ci: Add integration test for the confidential-containers changes scenarios

[stevenhorsman]

After https://github.com/kata-containers/tests/issues/4627 and https://github.com/kata-containers/kata-containers/issues/3996 are complete we should have the CI/CD jobs set-up to run against the CC parameter (just regression testing and using the containerd fork until the runtime changes are merged) and all of the development changes from the CCv0 branch into main. At this point we should be able to start adding in our confidential-containers integration tests, wherever we are up to based on the plan into main and they should run.

See https://github.com/kata-containers/tests/issues/4441 for some overall discussion of the merge