chore: Refactor the script for posting PRs for review on Slack (#43022)

This pull request refactors the GitHub Actions workflow for notifying
about stale Dashboard PRs by replacing custom JavaScript scripts and the
`actions/github-script` action with new TypeScript scripts that
communicate via standard input/output. This simplifies the workflow,
improves maintainability, and adds better error handling, especially for
API rate limits. The Slack notification script is also rewritten in
TypeScript and now reads PR data from stdin, making the workflow steps
more composable.

.github/workflows/dashboard-pr-reminder.yml

@@ -18,29 +18,26 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@08eba0b27e820071cde6df949e0beb9ba4906955 # v4.3.0
-
-      - name: Find Dashboard PRs older than 24 hours
-        id: find-prs
-        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7.1.0
         with:
-          script: |
-            const findStalePRs = require('./scripts/actions/find-stale-dashboard-prs.js');
-            return await findStalePRs({ github, context, core });
+          sparse-checkout: |
+            scripts
 
-      - name: Send Slack notification
-        if: fromJSON(steps.find-prs.outputs.count) > 0
-        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7.1.0
+      - uses: pnpm/action-setup@41ff72655975bd51cab0327fa583b6e92b6d3061 # v4.2.0
+        name: Install pnpm
+        with:
+          run_install: false
+
+      - name: Use Node.js
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+        with:
+          node-version-file: '.nvmrc'
+          cache: 'pnpm'
+
+      - name: Install deps
+        run: pnpm install --frozen-lockfile
+
+      - name: Find stale Dashboard PRs and notify Slack
         env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SLACK_WEBHOOK_URL: ${{ secrets.SLACK_DASHBOARD_WEBHOOK_URL }}
-          STALE_PRS_JSON: ${{ steps.find-prs.outputs.stale_prs }}
-        with:
-          script: |
-            const sendSlackNotification = require('./scripts/actions/send-slack-pr-notification.js');
-            const stalePRs = JSON.parse(process.env.STALE_PRS_JSON);
-            const webhookUrl = process.env.SLACK_WEBHOOK_URL;
-            await sendSlackNotification(stalePRs, webhookUrl);
-
-      - name: No stale PRs found
-        if: fromJSON(steps.find-prs.outputs.count) == 0
-        run: |
-          echo "✓ No Dashboard PRs older than 24 hours found"
+        run: pnpm tsx scripts/actions/find-stale-dashboard-prs.ts | pnpm tsx scripts/actions/send-slack-pr-notification.ts