Fix bot detection: use unique group for all review events

AI reviewer accounts (coderabbitai, copilot-pull-request-reviewer,
etc.) are Organization or User type, not Bot. Instead of trying to
detect bots, give all pull_request_review runs a unique concurrency
group so they never cancel pull_request benchmark runs. The self
job's if condition already gates for approved human reviews only.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sbryngelson

.github/workflows/bench.yml

@@ -7,15 +7,12 @@ on:
   workflow_dispatch:
 
 concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}${{ github.event_name == 'pull_request_review' && github.event.review.user.type == 'Bot' && format('-bot-{0}', github.run_id) || '' }}
+  group: ${{ github.workflow }}-${{ github.ref }}${{ github.event_name == 'pull_request_review' && format('-review-{0}', github.run_id) || '' }}
   cancel-in-progress: true
 
 jobs:
   file-changes:
     name: Detect File Changes
-    if: >
-      github.event_name != 'pull_request_review' ||
-      github.event.review.user.type != 'Bot'
     runs-on: 'ubuntu-latest'
     outputs:
       checkall: ${{ steps.changes.outputs.checkall }}