### 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)

k = KubernetesPodOperator(
            task_id="task",
            image_pull_policy="Always",
        )
        pod = k.build_pod_request_obj(create_context(k))
        assert pod.spec.containers[0].image_pull_policy == "Always"
    @patch(f"{POD_MANAGER_CLASS}.delete_pod")
    @patch(f"{KPO_MODULE}.KubernetesPodOperator.find_pod")
    def test_pod_delete_after_await_container_error(self, find_pod_mock, delete_pod_mock):
        """
        When KPO fails unexpectedly during await_container, we should still try to delete the pod,
        and the pod we try to delete should be the one returned from find_pod earlier.
        """
        cont_status = MagicMock()
        cont_status.name = "base"
        cont_status.state.terminated.message = "my-failure"
        find_pod_mock.return_value.status.container_statuses = [cont_status]
        k = KubernetesPodOperator(task_id="task")
        self.await_pod_mock.side_effect = AirflowException("fake failure")
        with pytest.raises(AirflowException, match="my-failure"):
            context = create_context(k)
            k.execute(context=context)
        delete_pod_mock.assert_called_with(find_pod_mock.return_value)
    @pytest.mark.parametrize("should_fail", [True, False])
    @patch(f"{POD_MANAGER_CLASS}.delete_pod")
    @patch(f"{POD_MANAGER_CLASS}.await_pod_completion")
    def test_pod_delete_not_called_when_creation_fails(self, await_pod_mock, delete_pod_mock, should_fail):