### Apache Airflow version

2.6.0

### What happened

Worker pod template file doesn't have an option to add priorityClassName. 

### What you think should happen instead

Airflow workers deployment however has the option to add it via the override airflow.workers.priorityClassName . We should reuse this for the worker pod template file too.

### How to reproduce

Trying to add a priorityClassName for airflow worker pod doesnt work. Unless we override the whole worker pod template with our own. But that is not preferrable as we will need to duplicate a lot of the existing template file. 

### Operating System

Rhel8

### Versions of Apache Airflow Providers

_No response_

### Deployment

Official Apache Airflow Helm Chart

### Deployment details

_No response_

### 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)

docs = render_chart(
            values={
                "airflowPodAnnotations": {"my_annotation": "airflowPodAnnotations"},
                "workers": {"podAnnotations": {"my_annotation": "workerPodAnnotations"}},
            },
            show_only=["templates/pod-template-file.yaml"],
            chart_dir=self.temp_chart_dir,
        )
        annotations = jmespath.search("metadata.annotations", docs[0])
        assert "my_annotation" in annotations
        assert "workerPodAnnotations" in annotations["my_annotation"]
    def test_should_add_extra_init_containers(self):
        docs = render_chart(
            values={
                "workers": {
                    "extraInitContainers": [
                        {"name": "test-init-container", "image": "test-registry/test-repo:test-tag"}
                    ],
                },
            },
            show_only=["templates/pod-template-file.yaml"],
            chart_dir=self.temp_chart_dir,
        )
        assert {
            "name": "test-init-container",
            "image": "test-registry/test-repo:test-tag",
        } == jmespath.search("spec.initContainers[-1]", docs[0])
    def test_should_add_extra_containers(self):