Avoid cancelling heavy CI on review events

[gyohuangxin]

Summary

• limit heavy CI workflow cancellation to pull_request events only
• prevent review approval/comment events from cancelling in-progress heavy CI runs

Notes

• This is the first-step change only. It does not add an approval de-duplication gate.

Testing

• Parsed updated workflow YAML files with Python yaml.safe_load
• Ran git diff --check

[github-actions]

🏷️ CI Guide

Runs automatically on every eligible PR before approval:

• ✅ Pre Checkin: Black, Ruff, catalog schema validation, non-GPU unit tests

Heavy model tests:

• ✅ Run after the PR is approved and Pre Checkin passes
• ✅ Run immediately when an approval review is submitted
• ✅ Can be requested before approval with labels

Label	Tests
ci:full	Run all heavy PR model tests: native ATOM, vLLM, and SGLang
ci:atom	Run native ATOM model accuracy tests
ci:vllm	Run ATOM vLLM OOT model accuracy tests
ci:sglang	Run ATOM SGLang model accuracy tests

Heavy jobs are skipped when the PR is not approved and no matching ci:* label is present.
Add labels via the sidebar or gh pr edit 1590 --add-label <label>

[Copilot]

Pull request overview

This PR adjusts GitHub Actions concurrency behavior so that in-progress heavy CI runs are only auto-cancelled for pull_request-triggered runs, preventing pull_request_review events (e.g., approvals/comments) from cancelling active heavy CI.

Changes:

• Updated concurrency.cancel-in-progress in heavy CI workflows to cancel-in-progress: ${{ github.event_name == 'pull_request' }}.
• Ensured pull_request_review-triggered workflow runs will no longer cancel ongoing heavy CI runs (they will queue instead, due to shared concurrency groups).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.github/workflows/atom-vllm-test.yaml	Limits cancellation to pull_request events so review submissions won’t cancel an active vLLM heavy CI run.
.github/workflows/atom-test.yaml	Limits cancellation to pull_request events so review submissions won’t cancel an active core ATOM heavy CI run.
.github/workflows/atom-sglang-test.yaml	Limits cancellation to pull_request events so review submissions won’t cancel an active SGLang heavy CI run.

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