GH-46593: [CI][Integration] Disable nested log grouping

[kou]

Rationale for this change

GitHub Actions support log grouping:
https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/workflow-commands-for-github-actions#grouping-log-lines

But it doesn't support nested grouping.

If we nest grouping, some logs may not be grouped. See #46593 for example.

What changes are included in this PR?

Stop GitHub Actions workflow commands including grouping while grouping.

Are these changes tested?

Yes.

Are there any user-facing changes?

No.

• GitHub Issue: [CI][Integration] Integration test logs may not hide details by group #46593

[github-actions]

⚠️ GitHub issue #46593 has been automatically assigned in GitHub to PR creator.

[kou]

Worked. (No details log for "Integration: Build: Java".)

https://github.com/apache/arrow/actions/runs/15264629388/job/42928067316?pr=46594#step:12:253

Integration: Build: Rust
Integration: Build: nanoarrow
Integration: Build: Go
Integration: Build: C++
Integration: Build: C#
Integration: Build: Java
+ '[' 1 -gt 0 ']'
+ /arrow/js/ci/scripts/build.sh /arrow/js
Integration: Build: JavaScript
+ pip install -e '/arrow/dev/archery[integration]'
Integration: Prepare: Archery

[kou]

+1

[conbench-apache-arrow]

After merging your PR, Conbench analyzed the 4 benchmarking runs that have been run so far on merge-commit 15ccd6d.

There were no benchmark performance regressions. 🎉

The full Conbench report has more details. It also includes information about 1 possible false positive for unstable benchmarks that are known to sometimes produce them.