### 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)

pod_template = self.full_pod_spec
        else:
            pod_template = k8s.V1Pod(metadata=k8s.V1ObjectMeta())
        pod = k8s.V1Pod(
            api_version="v1",
            kind="Pod",
            metadata=k8s.V1ObjectMeta(
                namespace=self.namespace,
                labels=self.labels,
                name=self.name,
                annotations=self.annotations,
            ),
            spec=k8s.V1PodSpec(
                node_selector=self.node_selector,
                affinity=self.affinity,
                tolerations=self.tolerations,
                init_containers=self.init_containers,
                containers=[
                    k8s.V1Container(
                        image=self.image,
                        name=self.base_container_name,
                        command=self.cmds,
                        ports=self.ports,
                        image_pull_policy=self.image_pull_policy,
                        resources=self.container_resources,
                        volume_mounts=self.volume_mounts,
                        args=self.arguments,
                        env=self.env_vars,
                        env_from=self.env_from,
                        security_context=self.container_security_context,