**What happened**:

When you have `dag.persistence` enabled and a `dag.gitSync.sshKeySecret` set, the gitSync container isn't added to the pod_template_file for k8s workers, as expected. However, `volumes` for it still are and maybe worse, the ssh key is mounted into the Airflow worker.

**What you expected to happen**:

When using `dag.persistence` and a `dag.gitSync.sshKeySecret`, nothing gitsync related is added to the k8s workers.

**How to reproduce it**:

Deploy the helm chart with `dag.persistence` enabled and a `dag.gitSync.sshKeySecret`.

e.g:
```
dags:
  persistence:
    enabled: true
  gitSync:
    enabled: true
    repo: {some_repo}
    sshKeySecret: my-gitsync-secret
extraSecrets:
  'my-gitsync-secret':
    data: |
      gitSshKey: {base_64_private_key}
```

**Anything else we need to know**:

After a quick look at CeleryExecutor workers, I don't think they are impacted, but worth double checking.
chart/tests/test_pod_template_file.py
docs = render_chart(
            values={},
            show_only=["templates/pod-template-file.yaml"],
            chart_dir=self.temp_chart_dir,
        )
        assert re.search("Pod", docs[0]["kind"])
        assert {'configMap': {'name': 'RELEASE-NAME-airflow-config'}, 'name': 'config'} == jmespath.search(
            "spec.volumes[1]", docs[0]
        )
        assert {
            'name': 'config',
            'mountPath': '/opt/airflow/airflow.cfg',
            'subPath': 'airflow.cfg',
            'readOnly': True,
        } == jmespath.search("spec.containers[0].volumeMounts[1]", docs[0])
    def test_should_create_valid_affinity_and_node_selector(self):
        docs = render_chart(
            values={
                "affinity": {
                    "nodeAffinity": {
                        "requiredDuringSchedulingIgnoredDuringExecution": {
                            "nodeSelectorTerms": [
                                {
                                    "matchExpressions": [
                                        {"key": "foo", "operator": "In", "values": ["true"]},
                                    ]
                                }