Problem with pushing Xcom when using SparkKubernetesOperator

### Apache Airflow version

Other Airflow 2 version (please specify below)

### If "Other Airflow 2 version" selected, which one?

2.8.3

### What happened?

I'm having an issue when using SparkKubernetesOperator to execute Spark job. Whenever i set do_xcom_push to True, the driver pod is created and run perfectly, but the xcom sidecar pod is nowhere to be found. Airflow log is thus stuck with this message:

> [2024-04-23, 02:47:38 UTC] {custom_object_launcher.py:301} WARNING - Spark job submitted but not yet started. job_id: spark-custome-task-5r3pt2vk
> [2024-04-23, 02:47:48 UTC] {pod_manager.py:529} ERROR - container base whose logs were requested not found in the pod spark-custome-task-5r3pt2vk-driver
> [2024-04-23, 02:47:48 UTC] {pod_manager.py:718} INFO - Checking if xcom sidecar container is started.
> [2024-04-23, 02:47:48 UTC] {pod_manager.py:724} WARNING - The xcom sidecar container is not yet started.
> [2024-04-23, 02:51:24 UTC] {local_task_job_runner.py:296} WARNING - DagRun timed out after 0:05:03.242442.
> [2024-04-23, 02:51:29 UTC] {local_task_job_runner.py:296} WARNING - DagRun timed out after 0:05:08.319418.
> [2024-04-23, 02:51:29 UTC] {local_task_job_runner.py:302} WARNING - State of this instance has been externally set to skipped. Terminating instance.
> [2024-04-23, 02:51:29 UTC] {process_utils.py:131} INFO - Sending 15 to group 30. PIDs of all processes in the group: [30]
> [2024-04-23, 02:51:29 UTC] {process_utils.py:86} INFO - Sending the signal 15 to group 30
> [2024-04-23, 02:51:29 UTC] {taskinstance.py:2483} ERROR - Received SIGTERM. Terminating subprocesses.
> [2024-04-23, 02:51:29 UTC] {process_utils.py:79} INFO - Process psutil.Process(pid=30, status='terminated', exitcode=0, started='02:46:43') (30) terminated with exit code 0

In my opinion, there should be something wrong with xcom push for this operator. Any help would be much appreciated. Thanks in advance.

### What you think should happen instead?

xcom pushed perfectly with any case of spark, maybe there will be placeholder for spark job with no return value or whatsoever

### How to reproduce

submit a basic spark application by using SparkKubernetesOperator to K8s cluster and set do_xcom_push to True

### Operating System

Ubuntu 22.04.4 LTS

### Versions of Apache Airflow Providers

apache-airflow-providers-cncf-kubernetes==8.0.1

### Deployment

Official Apache Airflow Helm Chart

### Deployment details

_No response_

### Anything else?

_No response_

### Are you willing to submit 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)

Start by reproducing the issue with SparkKubernetesOperator and do_xcom_push=True on a Kubernetes cluster. Inspect custom_object_launcher.py and pod_manager.py around the reported log messages, comparing the driver pod with the expected XCom sidecar behavior. Done means the sidecar starts and the task completes with XCom enabled.

Written by the indexing model from the issue text.