Remove custom automerge workflow (#30984)

.github/workflows/autoupdate-branch.yml

@@ -1,57 +0,0 @@
-name: Autoupdate branch
-
-# **What it does**: The next pull request in the merge queue will get its
-# branch updated with main. Only updating one branch ensures that pull requests
-# in the queue are merged sequentially.
-# **Why we have it**: So we don't have to watch pull requests and click
-# update branch 1000x.
-# **Who does it impact**: Our health.
-#
-# The merge queue consists of any pull requests with automerge enabled and
-# are mergeable. There is a label that can be used to skip to the front of
-# the queue (`skip-to-front-of-merge-queue`).
-#
-# This workflow is triggered when a `push` event occurs ON the `main` branch
-#  (e.g. a PR was merged or a force-push was done).
-#
-# This workflow runs on all PRs created from source branches within the
-# public and private docs repos but is won't work for PRs created from
-# forked repos.
-#
-
-on:
-  push:
-    branches:
-      - main
-
-permissions:
-  contents: read
-
-# This allows a subsequently queued workflow run to take priority over
-# previously queued runs but NOT interrupt currently executing runs
-concurrency:
-  group: '${{ github.workflow }} @ ${{ github.event.pull_request.head.label || github.head_ref || github.ref }}'
-  cancel-in-progress: false
-
-jobs:
-  autoupdate:
-    if: github.repository == 'github/docs-internal' || github.repository == 'github/docs'
-    name: autoupdate
-    runs-on: ubuntu-latest
-    steps:
-      - name: Check out repo content
-        uses: actions/checkout@dcd71f646680f2efd8db4afa5ad64fdcba30e748
-
-      - name: Setup Node
-        uses: actions/setup-node@17f8bd926464a1afa4c6a11669539e9c1ba77048
-        with:
-          node-version: '16.15.0'
-          cache: npm
-
-      - name: Install dependencies
-        run: npm ci
-
-      - name: Update next PR in queue
-        env:
-          GITHUB_TOKEN: ${{ secrets.DOCUBOT_REPO_PAT }}
-        run: node .github/actions-scripts/update-merge-queue-branch.js