fix(infra): prevent labeler workflow from adding/removing same labels (#33039)

The file-based and title-based labeler workflows were conflicting,
causing the bot to add and remove identical labels in the same
operation. Hopefully this fixes

Author: mdrxy

.github/workflows/labeler.yml

@@ -19,4 +19,4 @@ jobs:
       with:
         repo-token: "${{ secrets.GITHUB_TOKEN }}"
         configuration-path: .github/labeler.yml
-        sync-labels: true
+        sync-labels: false