`az ml pipeline list` does not return pipeline attributes

[algattik]

Extension name (the extension in question)

ml

Description of issue (in as much detail as possible)

Output of az ml pipeline list is messed up as it mixes fixed strings "Pipeline:" and objects into a single array. Also most of the pipeline attributes (Version, Tags etc.) are missing, although they are returned by the underlying call to 'https://westus2.aether.ms/api/v1.0/subscriptions/a4ed7b9a-b128-49b4-a6ee-fd07ff6e296d/resourceGroups/rg-myappdataops-test-main/providers/Microsoft.MachineLearningServices/workspaces/aml-myappdataops-test/Pipelines?activeOnly=true'.

az ml pipeline list                                                                        
[
  "Pipeline:",
  {
    "Endpoint": "https://westus2.aether.ms/api/v1.0/subscriptions/a4ed7b9a-b128-49b4-a6ee-fd07ff6e296d/resourceGroups/rg-myappdataops-test-main/providers/Microsoft.MachineLearningServices/workspaces/aml-myappdataops-test/PipelineRuns/PipelineSubmit/fa809332-6d2d-4336-8951-fcdcc3c0fb92",
    "Id": "fa809332-6d2d-4336-8951-fcdcc3c0fb92",
    "Name": "Feature Engineering",
    "Status": "Active"
  },
  "Pipeline:",
  {
    "Endpoint": "https://westus2.aether.ms/api/v1.0/subscriptions/a4ed7b9a-b128-49b4-a6ee-fd07ff6e296d/resourceGroups/rg-myappdataops-test-main/providers/Microsoft.MachineLearningServices/workspaces/aml-myappdataops-test/PipelineRuns/PipelineSubmit/6c83079d-923a-4fee-bbb7-46f9f3f4426c",
    "Id": "6c83079d-923a-4fee-bbb7-46f9f3f4426c",
    "Name": "Feature Engineering",
    "Status": "Active"
  },
  "Pipeline:",

---

[yonzhan]

ml