[backend] pipeline_version_id included in docs but does not exist on actual runs

[Gkrumbach07]

Environment

• KFP version: v2

Steps to reproduce

The v2 KFP api docs have some incorrect params. On runs and recurring runs, the api claims that a pipeline_version_id will be retuned but when fetching runs, it does not exist.

1. create a pipeline run
2. get the pipeline run data
3. see that there is no pipeline_version_id param included

Expected result

The docs to not include pipeline_version_id as param.

Materials and Reference

sample run

{
    "experiment_id": "a9947051-ead5-480c-acca-fd26ae14b81b",
    "run_id": "07fcea3b-0507-4951-978e-19df4cdaa686",
    "display_name": "TEST RUN",
    "storage_state": "AVAILABLE",
    "pipeline_version_reference": {
        "pipeline_id": "ed99bd96-ffa1-4656-bf97-9be14f77827e",
        "pipeline_version_id": "71735974-cd5e-4ae2-98d1-a0adee019195"
    },
    "runtime_config": { },
    "service_account": "pipeline-runner-dspa",
    "created_at": "2024-02-05T21:26:07Z",
    "scheduled_at": "2024-02-05T21:26:07Z",
    "finished_at": "1970-01-01T00:00:00Z",
    "state": "RUNNING",
    "run_details": {  }
    "state_history": [ ]
}

API docs
https://www.kubeflow.org/docs/components/pipelines/v2/reference/api/kubeflow-pipeline-api-spec/#/definitions/v2beta1Run

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