### 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,
        *,
        kubernetes_conn_id: str | None = None,  
        namespace: str | None = None,
        image: str | None = None,
        name: str | None = None,
        random_name_suffix: bool = True,
        cmds: list[str] | None = None,
        arguments: list[str] | None = None,
        ports: list[k8s.V1ContainerPort] | None = None,
        volume_mounts: list[k8s.V1VolumeMount] | None = None,
        volumes: list[k8s.V1Volume] | None = None,
        env_vars: list[k8s.V1EnvVar] | None = None,
        env_from: list[k8s.V1EnvFromSource] | None = None,
        secrets: list[Secret] | None = None,
        in_cluster: bool | None = None,
        cluster_context: str | None = None,
        labels: dict | None = None,
        reattach_on_restart: bool = True,
        startup_timeout_seconds: int = 120,
        get_logs: bool = True,
        image_pull_policy: str | None = None,
        annotations: dict | None = None,
        container_resources: k8s.V1ResourceRequirements | None = None,
        affinity: k8s.V1Affinity | None = None,
        config_file: str | None = None,
        node_selector: dict | None = None,
        image_pull_secrets: list[k8s.V1LocalObjectReference] | None = None,
        service_account_name: str | None = None,
        is_delete_operator_pod: bool = True,