### 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"""
        result = self.pod_manager.extract_xcom(pod)
        if isinstance(result, str) and result.rstrip() == "__airflow_xcom_result_empty__":
            self.log.info("Result file is empty.")
            return None
        else:
            self.log.info("xcom result: \n%s", result)
            return json.loads(result)
    def execute(self, context: Context):
        """Based on the deferrable parameter runs the pod asynchronously or synchronously"""
        if self.deferrable:
            self.execute_async(context)
        else:
            return self.execute_sync(context)
    def execute_sync(self, context: Context):
        try:
            self.pod_request_obj = self.build_pod_request_obj(context)
            self.pod = self.get_or_create_pod(  
                pod_request_obj=self.pod_request_obj,
                context=context,
            )
            
            self.remote_pod = self.find_pod(self.pod.metadata.namespace, context=context)
            self.await_pod_start(pod=self.pod)
            if self.get_logs:
                self.pod_manager.fetch_container_logs(
                    pod=self.pod,
                    container_name=self.base_container_name,