remove waiting-for-review auto label github action (#483)

.github/workflows/opened-pr-triage.yml

-name: Mark new pull request waiting review
-
-on:
-  pull_request:
-    types: [opened]
-
-jobs:
-  pr-waiting-review:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v3
-      
-      - uses: actions-ecosystem/action-add-labels@v1
-        with:
-          labels: waiting-review