### 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)

self.log.debug("Adding secret to task %s", self.task_id)
            pod = secret.attach_to_pod(pod)
        if self.do_xcom_push:
            self.log.debug("Adding xcom sidecar to task %s", self.task_id)
            pod = xcom_sidecar.add_xcom_sidecar(
                pod, sidecar_container_image=self.hook.get_xcom_sidecar_container_image()
            )
        labels = self._get_ti_pod_labels(context)
        self.log.info("Building pod %s with labels: %s", pod.metadata.name, labels)
        
        pod.metadata.labels.update(labels)
        
        
        pod.metadata.labels.update(
            {
                "airflow_version": airflow_version.replace("+", "-"),
                "airflow_kpo_in_cluster": str(self.hook.is_in_cluster),
            }
        )
        pod_mutation_hook(pod)
        return pod
    def dry_run(self) -> None:
        """
        Prints out the pod definition that would be created by this operator.
        Does not include labels specific to the task instance (since there isn't
        one in a dry_run) and excludes all empty elements.
        """
        pod = self.build_pod_request_obj()
        print(yaml.dump(prune_dict(pod.to_dict(), mode="strict")))
class _optionally_suppress(AbstractContextManager):