### Apache Airflow version

2.5.2

### What happened

Not sure if this is a feature not a bug, but I can use KubernetesPodOperator fine without setting a kubernetes_conn_id.
For example:
```
start = KubernetesPodOperator(
        namespace="mynamespace",
        cluster_context="mycontext",
        security_context={ 'runAsUser': 1000 },
        name="hello",
        image="busybox",
        image_pull_secrets=[k8s.V1LocalObjectReference('prodregistry')],
        cmds=["sh", "-cx"],
        arguments=["echo Start"],
        task_id="Start",
        in_cluster=False,
        is_delete_operator_pod=True,
        config_file="/home/airflow/.kube/config",
    )
```

But if I add deferrable=True to this it won't work. It seems to require an explicit kubernetes_conn_id (which we don't configure).

Is not possible to the deferrable version to work as the non deferrable one?

### What you think should happen instead

I hoped that kpo deferrable would work the same as non deferrable.

### How to reproduce

Use KPO with deferrable=True but no kubernetes_conn_id setting

### Operating System

Debian 11

### Versions of Apache Airflow Providers

_No response_

### Deployment

Official Apache Airflow Helm Chart

### Deployment details

_No response_

### 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)

if task.has_dag():
        dag = task.dag
    else:
        dag = DAG(dag_id="dag", start_date=pendulum.now())
        dag.add_task(task)
    dag_run = DagRun(
        run_id=DagRun.generate_run_id(DagRunType.MANUAL, DEFAULT_DATE),
        run_type=DagRunType.MANUAL,
        dag_id=dag.dag_id,
    )
    task_instance = TaskInstance(task=task, run_id=dag_run.run_id)
    task_instance.dag_run = dag_run
    if map_index is not None:
        task_instance.map_index = map_index
    if persist_to_db:
        with create_session() as session:
            session.add(DagModel(dag_id=dag.dag_id))
            session.add(dag_run)
            session.add(task_instance)
            session.commit()
    return {
        "dag": dag,
        "ts": DEFAULT_DATE.isoformat(),
        "task": task,
        "ti": task_instance,
        "task_instance": task_instance,
        "run_id": "test",
    }
@pytest.mark.execution_timeout(300)
class TestKubernetesPodOperator: