text: Title: BigQuery traceability labels were not available while using TaskGroup
  Body: ### Apache Airflow Provider(s)
  
  google
  
  ### Versions of Apache Airflow Providers
  
  apache-airflow-providers-google==12.0.0
  
  ### Apache Airflow version
  
  2.9.3
  
  ### Operating System
  
  Ubuntu
  
  ### Deployment
  
  Virtualenv installation
  
  ### Deployment details
  
  _No response_
  
  ### What happened
  
  BigQueryInsertJobOperator set traceability job labels(airflow-dag & airflow-task) in BigQuery jobs. But, when using the BigQueryInsertJobOperator with TaskGroup, the traceability labels were not available
  
  https://github.com/apache/airflow/commit/3e2bfb8b3ee80ddc18b00e461de53390dcc5a8b3
  
  ### What you think should happen instead
  
  traceability_labels = {"airflow-dag": dag_label, "airflow-task": task_label}
  
  The traceability labels should be available for BigQueryInsertJobOperator with TaskGroup
  
  ### How to reproduce
  
  ```
  from datetime import datetime, timedelta
  from airflow import DAG
  from airflow.providers.google.cloud.operators.bigquery import BigQueryInsertJobOperator
  from airflow.operators.dummy import DummyOperator
  from airflow.utils.task_group import TaskGroup
  
  
  default_args = {
      "retries": 1,
      "retry_delay": timedelta(minutes=1),
  }
  
  
  with DAG(
      "test_dag",
      default_args=default_args,
      description="BQ test DAG",
      schedule_interval=timedelta(days=1),
      start_date=datetime(2025, 3, 2),
      catchup=False,
  ) as dag:
      start = DummyOperator(task_id="start")
      with TaskGroup("taskgroup_1", tooltip="task group #1") as section_1:
          t1 = BigQueryInsertJobOperator(
              task_id="insert_job_1",
              configuration={
                  "query": {
                      "query": "SELECT * FROM `project.dataset.table_1`;",
                      "useLegacySql": False,
                  }            },
              gcp_conn_id="google_cloud_default",
          )
          t2 = BigQueryInsertJobOperator(
              task_id="insert_job_2",
              configuration={
                  "query": {
                      "query": "SELECT * FROM `project.dataset.table_1`;",
                      "useLegacySql": False,
                  },
              },
              gcp_conn_id="google_cloud_default",
          )
  
      end = DummyOperator(task_id="end")
  
      start >> section_1 >> end
  ```
  
  ### Anything else
  
  _No response_
  
  ### Are you willing to submit PR?
  
  - [ ] Yes I am willing to submit a PR!
  
  ### Code of Conduct
  
  - [x] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
  