Currently, the test does not work on ubuntu CI, unfortunately. Let's disable it at least tentatively.
And move the initrd related tests from TEST-01-BASIC there. Additionally, this should provide coverage for recemt shutdown initrd related issues, see: - https://github.com/systemd/systemd/issues/28645 - https://github.com/systemd/systemd/pull/28648 - https://github.com/systemd/systemd/pull/28793