kubeflow / pipelines / 3487

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update persistent agence to only store the argo spec

Currently when persisting the runs spawned from a job, PersistentAgent stores more information than needed into the pipeline manifest, and also miss the TypeMetadata. This resulted in storing lots of runtime information that's not needed.

Example WorkflowSpec
```
   "metadata":{
      "name":"fffpw4fh-2-2911767673",
      "namespace":"kubeflow",
      "selfLink":"/apis/argoproj.io/v1alpha1/namespaces/kubeflow/workflows/fffpw4fh-2-2911767673",
      "uid":"de23bd5c-a8c1-11e9-a176-42010a800233",
      "resourceVersion":"3975687",
      "generation":1,
      "creationTimestamp":"2019-07-17T18:37:02Z",
      "labels":{
         "scheduledworkflows.kubeflow.org/isOwnedByScheduledWorkflow":"true",
         "scheduledworkflows.kubeflow.org/scheduledWorkflowName":"fffpw4fh",
         "scheduledworkflows.kubeflow.org/workflowEpoch":"1563388612",
         "scheduledworkflows.kubeflow.org/workflowIndex":"2",
         "workflows.argoproj.io/phase":"Running"
      },
      "ownerReferences":[
         {
            "apiVersion":"kubeflow.org/v1beta1",
            "kind":"ScheduledWorkflow",
            "name":"fffpw4fh",
            "uid":"91039a28-a8c1-11e9-a176-42010a800233",
            "controller":true,
            "blockOwnerDeletion":true
         }
      ]
   },
```

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