Remove the E2E test. (#614)

* The e2e test is failing because kfctl has moved from kubeflow/kubeflow
  to kubfelow/kfctl (kubeflow/kfctl#7)

* The existing E2E test is an outdated copy of the old ksonnet workflow

* To unblock presubmits we are just deleting this test

* In a subsequent PR we will add back an E2E test but avoid duplicating the
  test and just check the test out from kubeflow/kubeflow or kubeflow/kfctl

related: #613

prow_config.yaml

@@ -6,16 +6,3 @@ workflows:
     name: e2e
     job_types:
       - presubmit
-  # Run kfctl E2E
-  - app_dir: kubeflow/manifests/tests/workflows
-    component: kfctl_go_test
-    name: kfctl-go
-    job_types:
-      - presubmit
-    params:
-      platform: gke
-      gkeApiVersion: v1
-      workflowName: kfctl-go
-      useIstio: true
-      version: master
-      configPath: kfdef/kfctl_gcp_iap.yaml