Remove branch cleanup

.github/workflows/branchcleanup.yml

----
-name: Branch Cleanup
-# This workflow is triggered on all closed pull requests.
-# However the script does not do anything it a merge was not performed.
-on:
-  pull_request:
-    types: [closed]
-
-env:
-  NO_BRANCH_DELETED_EXIT_CODE: 0
-  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: jessfraz/branch-cleanup-action@master