Replace workflow with project automations (#136831)

Remove unnecessary workflow

.github/workflows/project-updater.yml

@@ -1,31 +0,0 @@
-name: Update GH projects
-
-on:
-  issues:
-    types:
-      - opened
-      - labeled
-
-permissions:
-  contents: read
-
-jobs:
-  add-to-project:
-    name: Add issues to projects
-    runs-on: ubuntu-latest
-    timeout-minutes: 10
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          # if an issue has any of these labels, it will be added
-          # to the corresponding project
-          - { project:  2, label: "release-blocker, deferred-blocker" }
-          - { project: 32, label: sprint }
-
-    steps:
-      - uses: actions/add-to-project@v1.0.0
-        with:
-          project-url: https://github.com/orgs/python/projects/${{ matrix.project }}
-          github-token: ${{ secrets.ADD_TO_PROJECT_PAT }}
-          labeled: ${{ matrix.label }}