Nuke labeler workflow from the backport branch

.github/workflows/auto_labeler_pr.yml

@@ -1,16 +0,0 @@
-name: Auto Labeler - PRs
-on:
-  pull_request_target:
-
-permissions:
-  pull-requests: write
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Apply Type Label
-        uses: actions/labeler@v4
-        with:
-          repo-token: "${{ secrets.GITHUB_TOKEN }}"
-          sync-labels: ""  # this is a temporary workaround, see #4844