### Apache Airflow Provider(s)

cncf-kubernetes

### Versions of Apache Airflow Providers

apache-airflow-providers-cncf-kubernetes==5.2.1

### Apache Airflow version

2.5.1

### Operating System

Arch Linux

### Deployment

Other

### Deployment details

_No response_

### What happened

Not really showing a failure in operation, but the code in the [`KubernetesPodOperator._render_nested_template_fields`](https://github.com/apache/airflow/blob/d26dc223915c50ff58252a709bb7b33f5417dfce/airflow/providers/cncf/kubernetes/operators/kubernetes_pod.py#L373-L403) function could be improved.

The current code is formed by 6 conditionals checking the type of the `content` variable. Even when the 1st of the succeed, the other 5 conditionals are still checked, which is inefficient because the function could end right there, saving time and resources.


### What you think should happen instead

The conditionals flow could be fixed with a simple map, using a dictionary to immediately get the value or fallback to the default one.

### How to reproduce

There is no bug _per se_ to reproduce. It's just making the code cleaner and more efficient, avoiding to keep computing conditionals even when the condition has been resolved.

### Anything else

_No response_

### Are you willing to submit PR?

- [X] 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)

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(
        self,
        content: Any,
        context: Context,
        jinja_env: jinja2.Environment,
        seen_oids: set,
    ) -> None:
        if id(content) not in seen_oids:
            template_fields: tuple | None = None
            if isinstance(content, k8s.V1EnvVar):
                template_fields = ("value", "name")
            if isinstance(content, k8s.V1ResourceRequirements):
                template_fields = ("limits", "requests")
            if isinstance(content, k8s.V1Volume):
                template_fields = ("name", "persistent_volume_claim")
            if isinstance(content, k8s.V1VolumeMount):
                template_fields = ("name",)
            if isinstance(content, k8s.V1PersistentVolumeClaimVolumeSource):
                template_fields = ("claim_name",)
            if template_fields:
                seen_oids.add(id(content))
                self._do_render_template_fields(content, template_fields, context, jinja_env, seen_oids)
                return
        super()._render_nested_template_fields(content, context, jinja_env, seen_oids)
    @staticmethod
    def _get_ti_pod_labels(context: Context | None = None, include_try_number: bool = True) -> dict[str, str]: