### 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)

self.is_delete_operator_pod = is_delete_operator_pod
        self.hostnetwork = hostnetwork
        self.tolerations = (
            [convert_toleration(toleration) for toleration in tolerations] if tolerations else []
        )
        self.security_context = security_context or {}
        self.container_security_context = container_security_context
        self.dnspolicy = dnspolicy
        self.schedulername = schedulername
        self.full_pod_spec = full_pod_spec
        self.init_containers = init_containers or []
        self.log_events_on_failure = log_events_on_failure
        self.priority_class_name = priority_class_name
        self.pod_template_file = pod_template_file
        self.name = self._set_name(name)
        self.random_name_suffix = random_name_suffix
        self.termination_grace_period = termination_grace_period
        self.pod_request_obj: k8s.V1Pod | None = None
        self.pod: k8s.V1Pod | None = None
        self.base_container_name = base_container_name or self.BASE_CONTAINER_NAME
        self.deferrable = deferrable
        self.poll_interval = poll_interval
        self.remote_pod: k8s.V1Pod | None = None
        self._config_dict: dict | None = None
    @cached_property
    def _incluster_namespace(self):
        from pathlib import Path
        path = Path("/var/run/secrets/kubernetes.io/serviceaccount/namespace")
        return path.exists() and path.read_text() or None
    def _render_nested_template_fields(