Post sticky PR comment summarizing CI test job failures (#1412)

Add a `pr-test-summary` job that runs after all test jobs complete and posts a sticky comment on the PR listing which matrix jobs failed with direct links to their logs. The comment updates in-place on re-run.

<img width="990" height="1079" alt="image" src="https://github.com/user-attachments/assets/4648a3c5-78a3-403e-96db-44eed0e688ee" />

Authors:
  - Ramakrishna Prabhu (https://github.com/ramakrishnap-nv)

Approvers:
  - Miles Lubin (https://github.com/mlubin)
  - James Lamb (https://github.com/jameslamb)

URL: #1412

Author: ramakrishnap-nv

.github/workflows/pr.yaml

@@ -34,6 +34,7 @@ jobs:
       - wheel-tests-cuopt-server
       - wheel-build-cuopt-sh-client
       - test-self-hosted-server
+      - pr-test-summary
     permissions:
       contents: read
     uses: rapidsai/shared-workflows/.github/workflows/pr-builder.yaml@main
@@ -623,3 +624,25 @@ jobs:
     with:
       build_type: pull-request
       script: ci/test_self_hosted_service.sh
+  pr-test-summary:
+    needs:
+      - conda-cpp-tests
+      - conda-python-tests
+      - wheel-tests-cuopt
+      - wheel-tests-cuopt-server
+      - test-self-hosted-server
+    if: always()
+    continue-on-error: true
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+          sparse-checkout: ci/utils/pr_test_summary.py
+          sparse-checkout-cone-mode: false
+      - run: python3 ci/utils/pr_test_summary.py
+        env:
+          GH_TOKEN: ${{ github.token }}

ci/utils/pr_test_summary.py

@@ -139,12 +139,6 @@ def _build_body(failed, passed, skipped, job_analysis):
         lines.append(
             f"**{len(failed)} failed** · {len(passed)} passed · {len(skipped)} skipped"
         )
-        lines += ["", "| Job | Logs |", "|-----|------|"]
-        for job in failed:
-            lines.append(
-                f"| ❌ `{job['name']}` | [View logs]({job['html_url']}) |"
-            )
-
         for job in failed:
             tests = job_analysis[job["id"]]
             if not tests: