### 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)

container_name=self.base_container_name,
                    follow=True,
                )
            else:
                self.pod_manager.await_container_completion(
                    pod=self.pod, container_name=self.base_container_name
                )
            if self.do_xcom_push:
                self.pod_manager.await_xcom_sidecar_container_start(pod=self.pod)
                result = self.extract_xcom(pod=self.pod)
            self.remote_pod = self.pod_manager.await_pod_completion(self.pod)
        finally:
            self.cleanup(
                pod=self.pod or self.pod_request_obj,
                remote_pod=self.remote_pod,
            )
        ti = context["ti"]
        ti.xcom_push(key="pod_name", value=self.pod.metadata.name)
        ti.xcom_push(key="pod_namespace", value=self.pod.metadata.namespace)
        if self.do_xcom_push:
            return result
    def execute_async(self, context: Context):
        self.pod_request_obj = self.build_pod_request_obj(context)
        self.pod = self.get_or_create_pod(  
            pod_request_obj=self.pod_request_obj,
            context=context,
        )
        self.convert_config_file_to_dict()
        self.invoke_defer_method()
    def convert_config_file_to_dict(self):