### 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)

if self.reattach_on_restart:
            pod = self.find_pod(self.namespace or pod_request_obj.metadata.namespace, context=context)
            if pod:
                return pod
        self.log.debug("Starting pod:\n%s", yaml.safe_dump(pod_request_obj.to_dict()))
        self.pod_manager.create_pod(pod=pod_request_obj)
        return pod_request_obj
    def await_pod_start(self, pod: k8s.V1Pod):
        try:
            self.pod_manager.await_pod_start(pod=pod, startup_timeout=self.startup_timeout_seconds)
        except PodLaunchFailedException:
            if self.log_events_on_failure:
                for event in self.pod_manager.read_pod_events(pod).items:
                    self.log.error("Pod Event: %s - %s", event.reason, event.message)
            raise
    def extract_xcom(self, pod: k8s.V1Pod):