CI: Run Smoke Pack in Pull Requests

[kdaviduik]

Summary

• Add GitHub Actions workflow to run E2E smoke tests on pull requests
• Configure artifact upload for test failures
• Ensure CI integration blocks merges on test failures

Test Plan

• [ ] CI workflow runs on this PR
• [ ] Smoke tests execute successfully
• [ ] Artifacts are uploaded on any failures
• [ ] Non-zero exit code blocks PR merge

This is a draft PR to verify the CI workflow configuration.