Update JUnit report step in CI workflow: enable comment updates, group test suites, and avoid stack trace truncation.

Author: kpavlov

.github/workflows/build.yml

@@ -70,12 +70,16 @@ jobs:
         uses: mikepenz/action-junit-report@v6
         if: ${{ !cancelled() }} # always run even if the previous step fails
         with:
-          report_paths: '**/test-results/**/TEST-*.xml'
+          annotate_only: true
+          comment: true
           detailed_summary: true
           flaky_summary: true
+          group_suite: true
           include_empty_in_summary: false
           include_time_in_summary: true
-          annotate_only: true
+          report_paths: '**/test-results/**/TEST-*.xml'
+          truncate_stack_traces: false
+          updateComment: true
 
       - name: Disable Auto-Merge on Fail
         if: failure() && github.event_name == 'pull_request'