### 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)

will appear as part of this task's logs if get_logs is True. Defaults to None. If None,
        will consult the class variable BASE_CONTAINER_NAME (which defaults to "base") for the base
        container name to use.
    :param deferrable: Run operator in the deferrable mode.
    :param poll_interval: Polling period in seconds to check for the status. Used only in deferrable mode.
    """
    
    BASE_CONTAINER_NAME = "base"
    POD_CHECKED_KEY = "already_checked"
    POST_TERMINATION_TIMEOUT = 120
    template_fields: Sequence[str] = (
        "image",
        "cmds",
        "arguments",
        "env_vars",
        "labels",
        "config_file",
        "pod_template_file",
        "namespace",
        "container_resources",
        "volumes",
        "volume_mounts",
    )
    template_fields_renderers = {"env_vars": "py"}
    def __init__(
        self,
        *,
        kubernetes_conn_id: str | None = None,  
        namespace: str | None = None,
        image: str | None = None,