### 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)

node_selector = {"beta.kubernetes.io/os": "linux"}
        k = KubernetesPodOperator(
            task_id="task",
            node_selector=node_selector,
        )
        pod = k.build_pod_request_obj(create_context(k))
        sanitized_pod = self.sanitize_for_serialization(pod)
        assert isinstance(pod.spec.node_selector, dict)
        assert sanitized_pod["spec"]["nodeSelector"] == node_selector
    @pytest.mark.parametrize("do_xcom_push", [True, False])
    @patch(f"{POD_MANAGER_CLASS}.extract_xcom")
    @patch(f"{POD_MANAGER_CLASS}.await_xcom_sidecar_container_start")
    def test_push_xcom_pod_info(
        self, mock_await_xcom_sidecar_container_start, mock_extract_xcom, do_xcom_push
    ):
        """pod name and namespace are *always* pushed; do_xcom_push only controls xcom sidecar"""
        mock_extract_xcom.return_value = "{}"
        mock_await_xcom_sidecar_container_start.return_value = None
        k = KubernetesPodOperator(
            task_id="task",
            do_xcom_push=do_xcom_push,
        )
        pod = self.run_pod(k)
        pod_name = XCom.get_one(run_id=self.dag_run.run_id, task_id="task", key="pod_name")
        pod_namespace = XCom.get_one(run_id=self.dag_run.run_id, task_id="task", key="pod_namespace")
        assert pod_name == pod.metadata.name
        assert pod_namespace == pod.metadata.namespace
    @patch(HOOK_CLASS, new=MagicMock)
    def test_previous_pods_ignored_for_reattached(self):