### 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)

dag_id: str | None = None,
    task_id: str | None = None,
    *,
    max_length: int = 80,
    unique: bool = True,
) -> str:
    """
    Generates unique pod ID given a dag_id and / or task_id.
    TODO: when min airflow version >= 2.5, delete this function and import from kubernetes_helper_functions.
    :param dag_id: DAG ID
    :param task_id: Task ID
    :param max_length: max number of characters
    :param unique: whether a random string suffix should be added
    :return: A valid identifier for a kubernetes pod name
    """
    if not (dag_id or task_id):
        raise ValueError("Must supply either dag_id or task_id.")
    name = ""
    if dag_id:
        name += dag_id
    if task_id:
        if name:
            name += "-"
        name += task_id
    base_name = slugify(name, lowercase=True)[:max_length].strip(".-")
    if unique:
        return _add_pod_suffix(pod_name=base_name, max_len=max_length)
    else:
        return base_name
class PodReattachFailure(AirflowException):