remove changelog check (#4996)

.github/workflows/check-changelog.yml

@@ -1,20 +0,0 @@
-name: check-changelog
-
-on:
-  pull_request:
-    types: [opened, synchronize, labeled, unlabeled]
-
-jobs:
-  check-changelog-updated:
-    name: Check CHANGELOG file
-    runs-on: ubuntu-latest
-    if: ${{ !contains( github.event.pull_request.labels.*.name, 'no-changelog-update') }}
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-        with:
-          ref: ${{ github.event.pull_request.head.ref }}
-          repository: ${{ github.event.pull_request.head.repo.full_name }}
-      - name: Release notes added
-        run: |
-          cat CHANGELOG.md client/python/CHANGELOG.md | grep -w "https://github.com/gradio-app/gradio/pull/${{ github.event.number }}"