[Internal] Adds approval as a feed notification. (#39450)

* add approval to feed

* appease yamllint

.github/workflows/pull_request_review.yml

@@ -0,0 +1,51 @@
+name: Pull Request Review
+
+permissions:
+  contents: read
+
+on:
+  pull_request_review:
+    types: [submitted]
+
+jobs:
+  approved:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Community Check
+        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+        with:
+          sparse-checkout: .github/actions/community_check
+
+      - name: Run Community Check
+        id: community_check
+        uses: ./.github/actions/community_check
+        with:
+          user_login: ${{ github.event.review.user.login }}
+          maintainers: ${{ secrets.MAINTAINERS }}
+          partners: ${{ secrets.PARTNERS }}
+
+      - name: Maintainer Approval
+        if: |
+          github.event.review.state == 'approved'
+          && (steps.community_check.outputs.maintainer == 'true' || steps.community_check.outputs.partner == 'true')
+        uses: slackapi/slack-github-action@37ebaef184d7626c5f204ab8d3baff4262dd30f0 # v1.27.0
+        env:
+          REVIEW_AUTHOR_URL: ${{ github.event.review.user.html_url }}
+          REVIEW_AUTHOR_LOGIN: ${{ github.event.review.user.login }}
+          PR_HTML_URL: ${{ github.event.pull_request.html_url }}
+          PR_TITLE: ${{ github.event.pull_request.title }}
+          SLACK_WEBHOOK_URL: ${{ secrets.FEED_SLACK_WEBHOOK_URL }}
+          SLACK_WEBHOOK_TYPE: INCOMING_WEBHOOK
+        with:
+          payload: |
+            {
+              "blocks": [
+                {
+                  "type": "section",
+                  "text": {
+                    "type": "mrkdwn",
+                    "text": ${{ toJSON(format(':bufo-approves: <{0}|{1}> approved <{2}|{3}>', env.REVIEW_AUTHOR_URL, env.REVIEW_AUTHOR_LOGIN, env.PR_HTML_URL, env.PR_TITLE)) }}
+                  }
+                }
+              ]
+            }