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Initiates a pipeline start operation.

Upon success, MLMD is updated to signal that the pipeline must be started.

mlmd_handle A handle to the MLMD db.
pipeline IR of the pipeline to start.

The PipelineState object upon success.

status_lib.StatusNotOkError Failure to initiate pipeline start. With code INVALILD_ARGUMENT if it's a sync pipeline without pipeline_run_id provided.