[SPARK-54366][INFRA] Add free_disk_space_container step to K8s integration test GitHub Action job

[dongjoon-hyun]

What changes were proposed in this pull request?

This PR aims to add free_disk_space_container step to K8s integration test GitHub Action job.

Why are the changes needed?

The CI is flaky due to No space left on device error.

• https://github.com/apache/spark/actions/runs/19354883389/job/55448531341

[info]   25/11/14 21:27:02 ERROR TaskSchedulerImpl: Lost executor 4 on 10.244.0.67: Unable to create executor due to /var/data/spark-163899dd-08da-4b76-b71d-c428207a3bdf/spark-1e9d976f-69b3-4274-af03-300cfc4d6fd5/-14621403551763155568738_cache
-> ./software.amazon.awssdk_bundle-2.29.52.jar:
No space left on device

Like the other four GitHub Action jobs, free_disk_space_container will mitigate this situation in this job.

$ git grep ./dev/free_disk_space_container
.github/workflows/build_and_test.yml:      run: ./dev/free_disk_space_container
.github/workflows/build_and_test.yml:      run: ./dev/free_disk_space_container
.github/workflows/build_and_test.yml:      run: ./dev/free_disk_space_container
.github/workflows/build_and_test.yml:      run: ./dev/free_disk_space_container

Does this PR introduce any user-facing change?

No, this is a test infra change.

How was this patch tested?

Pass the CIs.

Was this patch authored or co-authored using generative AI tooling?

No.