### 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)

for the Kubernetes cluster.
    :param namespace: the namespace to run within kubernetes.
    :param image: Docker image you wish to launch. Defaults to hub.docker.com,
        but fully qualified URLS will point to custom repositories. (templated)
    :param name: name of the pod in which the task will run, will be used (plus a random
        suffix if random_name_suffix is True) to generate a pod id (DNS-1123 subdomain,
        containing only [a-z0-9.-]).
    :param random_name_suffix: if True, will generate a random suffix.
    :param cmds: entrypoint of the container. (templated)
        The docker images's entrypoint is used if this is not provided.
    :param arguments: arguments of the entrypoint. (templated)
        The docker image's CMD is used if this is not provided.
    :param ports: ports for the launched pod.
    :param volume_mounts: volumeMounts for the launched pod.
    :param volumes: volumes for the launched pod. Includes ConfigMaps and PersistentVolumes.
    :param env_vars: Environment variables initialized in the container. (templated)
    :param env_from: (Optional) List of sources to populate environment variables in the container.
    :param secrets: Kubernetes secrets to inject in the container.
        They can be exposed as environment vars or files in a volume.
    :param in_cluster: run kubernetes client with in_cluster configuration.
    :param cluster_context: context that points to kubernetes cluster.
        Ignored when in_cluster is True. If None, current-context is used.
    :param reattach_on_restart: if the worker dies while the pod is running, reattach and monitor
        during the next try. If False, always create a new pod for each try.
    :param labels: labels to apply to the Pod. (templated)
    :param startup_timeout_seconds: timeout in seconds to startup the pod.
    :param get_logs: get the stdout of the base container as logs of the tasks.
    :param image_pull_policy: Specify a policy to cache or always pull an image.
    :param annotations: non-identifying metadata you can attach to the Pod.
        Can be a large range of data, and can include characters