ci: stop commenting unit test results on PR (datahub-project#6700)

The results will still be surfaced under the "Test Results" action
workflow, but the results won't be commented on the PR itself.

.github/workflows/test-results.yml

@@ -29,10 +29,11 @@ jobs:
           done
 
       - name: Publish Unit Test Results
-        uses: EnricoMi/publish-unit-test-result-action@v1
+        uses: EnricoMi/publish-unit-test-result-action@v2
         with:
           check_name: "Unit Test Results (${{ github.event.workflow_run.name }})"
           commit: ${{ github.event.workflow_run.head_sha }}
           event_file: artifacts/Event File/event.json
           event_name: ${{ github.event.workflow_run.event }}
           files: "artifacts/**/*.xml"
+          comment_mode: off