### 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)

"spec.jobTemplate.spec.template.spec.containers[0].securityContext", docs[0]
        )
        assert ctx_value_pod == jmespath.search(
            "spec.jobTemplate.spec.template.spec.securityContext", docs[0]
        )
        for doc in docs[1:-3]:
            assert ctx_value_container == jmespath.search(
                "spec.template.spec.containers[0].securityContext", doc
            )
            assert ctx_value_pod == jmespath.search("spec.template.spec.securityContext", doc)
        
        default_ctx_value_container = {"allowPrivilegeEscalation": False, "capabilities": {"drop": ["ALL"]}}
        default_ctx_value_pod_pgbouncer = {"runAsUser": 65534}
        default_ctx_value_pod_statsd = {"runAsUser": 65534}
        default_ctx_value_pod_redis = {"runAsUser": 0}
        for doc in docs[-3:]:
            assert default_ctx_value_container == jmespath.search(
                "spec.template.spec.containers[0].securityContext", doc
            )
        
        assert default_ctx_value_container == jmespath.search(
            "spec.template.spec.containers[1].securityContext", docs[-3]
        )
        assert default_ctx_value_pod_pgbouncer == jmespath.search(
            "spec.template.spec.securityContext", docs[-3]
        )
        assert default_ctx_value_pod_statsd == jmespath.search("spec.template.spec.securityContext", docs[-2])
        assert default_ctx_value_pod_redis == jmespath.search("spec.template.spec.securityContext", docs[-1])
    
    def test_main_container_setting(self):