### Official Helm Chart version

1.10.0 (latest released)

### Apache Airflow version

2.7.1

### Kubernetes Version

1.26.7

### Helm Chart configuration

_No response_

### Docker Image customizations

_No response_

### What happened

When enabling `dagProcessor.logGroomerSidecar`, our OPA gatekeeper flags the `dag-processor-log-groomer` container with the appropriate non-root permissions. There is no way to set the `securityContexts` for this sidecar as it is not even enabled.

### What you think should happen instead

The `securityContexts` setting for the `dag-processor-log-groomer` container should be configurable.

### How to reproduce

In the Helm values, set `dagProcessor.logGroomerSidecar` to `true`.

### Anything else

This problem occurs when there are OPA policies in place pertaining to strict `securityContexts` settings.

### 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={
                "dags": {"gitSync": {"enabled": True, "uid": 9000, "securityContext": {"runAsUser": 8000}}},
                "airflowVersion": "1.10.15",
            },
            show_only=[
                "templates/workers/worker-deployment.yaml",
                "templates/webserver/webserver-deployment.yaml",
                "templates/scheduler/scheduler-deployment.yaml",
            ],
        )
        for doc in docs:
            assert "git-sync" in [c["name"] for c in jmespath.search("spec.template.spec.containers", doc)]
            assert "git-sync-init" in [
                c["name"] for c in jmespath.search("spec.template.spec.initContainers", doc)
            ]
            assert 8000 == jmespath.search(
                "spec.template.spec.initContainers[?name=='git-sync-init'].securityContext.runAsUser | [0]",
                doc,
            )
            assert 8000 == jmespath.search(
                "spec.template.spec.containers[?name=='git-sync'].securityContext.runAsUser | [0]",
                doc,
            )
    
    def test_global_security_context(self):