### 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)

raise ValueError(
                "Param `node_selectors` supplied. This param is no longer supported. "
                "Use `node_selector` instead."
            )
        super().__init__(**kwargs)
        self.kubernetes_conn_id = kubernetes_conn_id
        self.do_xcom_push = do_xcom_push
        self.image = image
        self.namespace = namespace
        self.cmds = cmds or []
        self.arguments = arguments or []
        self.labels = labels or {}
        self.startup_timeout_seconds = startup_timeout_seconds
        self.env_vars = convert_env_vars(env_vars) if env_vars else []
        if pod_runtime_info_envs:
            self.env_vars.extend([convert_pod_runtime_info_env(p) for p in pod_runtime_info_envs])
        self.env_from = env_from or []
        if configmaps:
            self.env_from.extend([convert_configmap(c) for c in configmaps])
        self.ports = [convert_port(p) for p in ports] if ports else []
        self.volume_mounts = [convert_volume_mount(v) for v in volume_mounts] if volume_mounts else []
        self.volumes = [convert_volume(volume) for volume in volumes] if volumes else []
        self.secrets = secrets or []
        self.in_cluster = in_cluster
        self.cluster_context = cluster_context
        self.reattach_on_restart = reattach_on_restart
        self.get_logs = get_logs
        self.image_pull_policy = image_pull_policy
        self.node_selector = node_selector or {}
        self.annotations = annotations or {}