tests: Add virtio queue affinity test for confidential VMs

Add test_virtio_queue_affinity to the common_cvm integration
test module to verify that per-queue CPU pinning works correctly
in confidential guest environments.

The test creates a 4-vCPU Ubuntu Jammy-based confidential VM
using GuestFactory and delegates to the existing
_test_virtio_queue_affinity helper to validate queue-to-core
affinity settings.

Signed-off-by: Muminul Islam <muislam@microsoft.com>

cloud-hypervisor/tests/integration.rs

@@ -14970,4 +14970,13 @@ mod common_cvm {
             .with_cpu(2);
         _test_cpu_affinity(&guest);
     }
+
+    #[test]
+    fn test_virtio_queue_affinity() {
+        let disk_config = UbuntuDiskConfig::new(JAMMY_IMAGE_NAME.to_string());
+        let guest = GuestFactory::new_confidential_guest_factory()
+            .create_guest(Box::new(disk_config))
+            .with_cpu(4);
+        _test_virtio_queue_affinity(&guest);
+    }
 }