ci: give non-PR code quality runs distinct concurrency groups

[arham766]

What does this PR do?

Type of change: Bug fix

The concurrency group used github.event.pull_request.number with no fallback, so every nightly and manually dispatched run shared the literal group Code Quality- with cancel-in-progress: true — a manual dispatch cancels an in-flight nightly and vice versa. Adds the || github.sha fallback already used by unit_tests.yml.

Usage

N/A — CI workflow configuration change.

Testing

Matches the existing pattern in unit_tests.yml line-for-line. YAML validated.

Before your PR is "Ready for review"

• Is this change backward compatible?: ✅
• If you copied code from any other sources or added a new PIP dependency, did you follow guidance in CONTRIBUTING.md: N/A
• Did you write any new necessary tests?: N/A (workflow config; validated as described above)
• Did you update Changelog?: N/A (CI-only change)
• Did you get Claude approval on this PR?: N/A (external contributor; cannot trigger /claude review)

Additional Information

Part of #1890 (item 4).

Summary by CodeRabbit

• Chores
  • Improved workflow concurrency handling so automated runs are grouped and canceled more reliably across pull request, manual, and scheduled triggers.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Enterprise

Run ID: 05e08661-1f5f-42a5-8170-78dac18970f2

📥 Commits

Reviewing files that changed from the base of the PR and between 4b9225b and 49aed56.

📒 Files selected for processing (1)

• .github/workflows/code_quality.yml

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📝 Walkthrough

Walkthrough

The concurrency group key in the code_quality GitHub Actions workflow was modified to combine the workflow name with either the pull request number or the commit SHA, replacing the previous PR-number-only grouping.

Changes

Workflow Concurrency Configuration

Layer / File(s)	Summary
Update concurrency group key .github/workflows/code_quality.yml	Changed the concurrency.group value to ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}, adding a fallback to the commit SHA when no PR number exists.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 6

✅ Passed checks (6 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the CI workflow change to separate non-PR code quality concurrency groups.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Security Anti-Patterns	✅ Passed	No changed modelopt/examples code adds unsafe load/eval patterns; trust_remote_code stays caller-configurable, and new deps are permissive.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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