### 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)

"""Retrieves XCom value and kills xcom sidecar container"""
        with closing(
            kubernetes_stream(
                self._client.connect_get_namespaced_pod_exec,
                pod.metadata.name,
                pod.metadata.namespace,
                container=PodDefaults.SIDECAR_CONTAINER_NAME,
                command=["/bin/sh"],
                stdin=True,
                stdout=True,
                stderr=True,
                tty=False,
                _preload_content=False,
            )
        ) as resp:
            result = self._exec_pod_command(
                resp,
                f"if [ -s {PodDefaults.XCOM_MOUNT_PATH}/return.json ]; then cat {PodDefaults.XCOM_MOUNT_PATH}/return.json; else echo __airflow_xcom_result_empty__; fi",  
            )
            self._exec_pod_command(resp, "kill -s SIGINT 1")
        if result is None:
            raise AirflowException(f"Failed to extract xcom from pod: {pod.metadata.name}")
        return result
    def _exec_pod_command(self, resp, command: str) -> str | None: