ci: Stop testing with "kata-clh" for now

Unless someone opposes to that, I'd like to propose we stop testing with
Cloud Hypervisor for now, as it still doesn't have TEE support.

At the moment TEE support is added, we get back to testing it.

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

.github/workflows/ccruntime_e2e.yaml

@@ -21,14 +21,10 @@ jobs:
       matrix:
         runtimeclass:
           - "kata-qemu"
-          - "kata-clh"
         instance:
           - "az-ubuntu-2004"
           - "az-ubuntu-2204"
           - "s390x"
-        exclude:
-          - runtimeclass: "kata-clh"
-            instance: "s390x"
     runs-on: ${{ matrix.instance }}
     steps:
       - name: Take a pre-action for self-hosted runner