### Description

Add a process_line callback to KubernetesPodOperator 
Like https://github.com/apache/airflow/blob/main/airflow/providers/apache/beam/operators/beam.py#LL304C36-L304C57 the `BeamRunPythonPipelineOperator`, which allows the user to add stateful plugins based on the logging from docker job 

### Use case/motivation

I can add a plugin based on the logging and also allow cleanup on_kill based on the job creation log. 

### Related issues

_No response_

### Are you willing to submit a PR?

- [ ] 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)

"""Retrieves XCom value and also checks if xcom json is valid."""
        with closing(
            kubernetes_stream(
                self._client.connect_get_namespaced_pod_exec,
                pod.metadata.name,
                pod.metadata.namespace,
                container=PodDefaults.SIDECAR_CONTAINER_NAME,
                command=["/bin/sh"],
                stdin=True,
                stdout=True,
                stderr=True,
                tty=False,
                _preload_content=False,
            )
        ) as resp:
            result = self._exec_pod_command(
                resp,
                f"if [ -s {PodDefaults.XCOM_MOUNT_PATH}/return.json ]; then cat {PodDefaults.XCOM_MOUNT_PATH}/return.json; else echo __airflow_xcom_result_empty__; fi",  
            )