Chore: Add anti-slop job to PR workflow (#12248)

.github/workflows/pr-bot.yml

@@ -2,13 +2,24 @@ name: PR Bot
 on:
   pull_request_target:
     types: [opened]
-permissions:
-  contents: read
-  pull-requests: write
 jobs:
+  anti-slop:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      issues: read
+      pull-requests: write
+    steps:
+      - uses: peakoss/anti-slop@v0.2.1
+        with:
+          max-failures: 4
+          failure-add-pr-labels: 'ai'
   pr-bot:
     name: Automated PR Bot
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
     steps:
       - name: Label PR by file path or branch name
         # see .github/labeler.yml for the labeler config