class_docstr: Helper class for constructing Storage Transfer Job Link.
code: def persist(
      task_instance,
      context: Context,
      project_id: str,
      job_name: str,
  ):
      job_name = job_name.split("/")[1] if job_name else ""
  
      task_instance.xcom_push(
          context,
          key=CloudStorageTransferJobLink.key,
          value={
              "project_id": project_id,
              "transfer_job": job_name,
          },
      )
  
file_path: airflow/airflow/providers/google/cloud/links/cloud_storage_transfer.py
imports: from __future__ import annotations
  from typing import TYPE_CHECKING
  from airflow.providers.google.cloud.links.base import BaseGoogleLink
label_desc: Use image node_id 1 for calling the CloudStorageTransferJobLink obj's underlying member method code with example usage: obj.persist(task_instance, context, project_id, job_name) without return types