[BUG] kbcli connect ob cluster error: fail to get the target engine type

[JashBook]

Describe the bug A clear and concise description of what the bug is.

To Reproduce Steps to reproduce the behavior:

1. create cluster

   apiVersion: apps.kubeblocks.io/v1alpha1
   kind: Cluster
   metadata:
   name: obce-qmntco
   namespace: default
   annotations:
   "kubeblocks.io/extra-env": '{"TENANT_NAME":"tenant2","ZONE_COUNT":"1","OB_CLUSTERS_COUNT":"2","TENANT_CPU":"2","TENANT_MEMORY":"2G","TENANT_DISK":"5G"}'
   spec:
   terminationPolicy: DoNotTerminate
   componentSpecs:
   - name: ob-ce-0
     componentDefRef: ob-ce
     componentDef: ob-ce-repl
     replicas: 1
     resources:
       requests:
         cpu: 3000m
         memory: 8Gi
       limits:
         cpu: 3000m
         memory: 8Gi
     volumeClaimTemplates:
       - name: data-file
         spec:
           accessModes:
             - ReadWriteOnce
           resources:
             requests:
               storage: "50Gi"
       - name: data-log
         spec:
           accessModes:
             - ReadWriteOnce
           resources:
             requests:
               storage: "50Gi"
       - name: log
         spec:
           accessModes:
             - ReadWriteOnce
           resources:
             requests:
               storage: "10Gi"
       - name: workdir
         spec:
           accessModes:
             - ReadWriteOnce
           resources:
             requests:
               storage: "100Mi"
   - name: ob-ce-1
     componentDefRef: ob-ce
     componentDef: ob-ce-repl
     replicas: 1
     resources:
       requests:
         cpu: 3000m
         memory: 8Gi
       limits:
         cpu: 3000m
         memory: 8Gi
     volumeClaimTemplates:
       - name: data-file
         spec:
           accessModes:
             - ReadWriteOnce
           resources:
             requests:
               storage: "50Gi"
       - name: data-log
         spec:
           accessModes:
             - ReadWriteOnce
           resources:
             requests:
               storage: "50Gi"
       - name: log
         spec:
           accessModes:
             - ReadWriteOnce
           resources:
             requests:
               storage: "10Gi"
       - name: workdir
         spec:
           accessModes:
             - ReadWriteOnce
           resources:
             requests:
               storage: "100Mi"

2. See error

   
   kbcli cluster connect obce-qmntco 
   error: fail to get the target engine type

kbcli cluster connect -i obce-qmntco-ob-ce-0-0 error: fail to get the target engine type

**Expected behavior**
kbcli connect ob cluster success

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**Desktop (please complete the following information):**
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**Additional context**
Add any other context about the problem here.

[ahjing99]

lower the severity since ob can be connected without kbli