### 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)

affinity = {
            "node_affinity": {
                "preferred_during_scheduling_ignored_during_execution": [
                    {
                        "preference": {
                            "match_expressions": [
                                {"key": "kubernetes.io/role", "operator": "In", "values": ["foo", "bar"]}
                            ],
                            "match_fields": None,
                        },
                        "weight": 1,
                    }
                ],
                "required_during_scheduling_ignored_during_execution": {
                    "node_selector_terms": [
                        {
                            "match_expressions": [
                                {"key": "kubernetes.io/role", "operator": "In", "values": ["foo", "bar"]}
                            ],
                            "match_fields": None,
                        }
                    ]
                },
            },
            "pod_affinity": None,
            "pod_anti_affinity": None,
        }
        assert pod.spec.affinity.to_dict() == affinity
    @pytest.mark.parametrize(("randomize_name",), ([True], [False]))
    def test_pod_template_file_kwargs_override(self, randomize_name, pod_template_file):