[SPARK-53826] Use Java 25 in GitHub Action jobs consistently

[dongjoon-hyun]

What changes were proposed in this pull request?

This PR aims to use Java 25 in GitHub Action jobs consistently.

• https://github.com/apache/spark-kubernetes-operator/actions/workflows/build_and_test.yml
• https://github.com/apache/spark-kubernetes-operator/actions/workflows/publish_snapshot_chart.yml

Why are the changes needed?

We had better use Java 25 by default because our tool chain is Java 25.

• [SPARK-53701] Use Java 25 toolchain while supporting Java 17+ #336

BEFORE

$ git grep 'java-version: 17' | wc -l
       3
$ git grep 'java-version: 21' | wc -l
       1

AFTER

$ git grep 'java-version: 17' | wc -l
       0
$ git grep 'java-version: 21' | wc -l
       0

Does this PR introduce any user-facing change?

No behavior change.

How was this patch tested?

Pass the CIs.

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

No.

[dongjoon-hyun]

Thank you, @viirya . Merged to main.