ci: stop stray review comments cancelling in-progress AI reviews

[nsportsman]

What

Changes the AI-reviewer caller concurrency from cancel-in-progress: true to:

cancel-in-progress: ${{ github.event_name == 'pull_request' }}

Why

These callers trigger on pull_request_review_comment, and every comment shares
the same per-PR concurrency group. Workflow-level concurrency is evaluated at run
creation — before the reusable's preflight @mention gate skips a stray
comment — so an unconditional true lets any inline review comment cancel an
in-progress review and leave the PR with none.

Gating cancellation on pull_request (open/ready) events means stray review
comments queue behind a running review and no-op instead of killing it, while
open/ready dedup is preserved.

Same class of bug as google-github-actions/run-gemini-cli#195.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 0b14c8f3-9910-4196-b15a-240bb5aba198

📥 Commits

Reviewing files that changed from the base of the PR and between c7754c4 and a38488e.

📒 Files selected for processing (2)

• .github/workflows/codex-code.yml
• .github/workflows/gemini-code.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/concurrency-no-cancel-on-comment

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[github-actions]

Gemini review skipped — non-code PR (only changed files matching docs/**, .github/**, .claude-plugin/**, *.md, *.txt, images, or license-like files). Post @gemini on a review comment to force a review.

[github-actions]

Codex review skipped — non-code PR (only changed files matching docs/**, .github/**, .claude-plugin/**, *.md, *.txt, images, or license-like files). Post @codex on a review comment to force a review.

[github-actions]

Claude review skipped — non-code PR (only changed files matching docs/**, .github/**, .claude-plugin/**, *.md, *.txt, images, or license-like files). Post @claude on a review comment to force a review.