chore: Remove the sync job, we don't use it any more (#2591)

.github/workflows/sync.yml

@@ -1,18 +0,0 @@
-name: Sync Files
-on:
-  push:
-    branches:
-      - main
-  workflow_dispatch:
-jobs:
-  sync:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout Repository
-        uses: actions/checkout@v3
-      - name: Run GitHub File Sync
-        uses: Redocly/repo-file-sync-action@main
-        with:
-          GH_PAT: ${{ secrets.GH_PAT }}
-          COMMIT_PREFIX: 'sync:'
-          SKIP_PR: true