ci: Add test cases for CoCo image pulling without forked containerd

[ChengyuZhu6]

Additional tests are necessary to verify new feature that pulling image without forked containerd in CoCo. 1)image sharing on the host without dm-verity. 2)image sharing on the host with dm-verity. 3)image pulling in the guest with nydus-snapshotter.

Fixes #5763

Depends-on: https://github.com/kata-containers/kata-containers/pull/7676