Ignore hobo test from live test

Author: wenxuan0923

src/aks-preview/azcli_aks_live_test/configs/ext_matrix_default.json

@@ -31,7 +31,8 @@
             "test_aks_nodepool_add_with_workload_runtime"
         ],
         "automatic, no quota": [
-            "test_aks_automatic_sku"
+            "test_aks_automatic_sku",
+            "test_aks_automatic_sku_with_hosted_system_enabled"
         ],
         "maxBlockedNodes, missing feature registration & toggle": [
             "test_aks_nodepool_max_blocked_nodes"