ci: use new GitHub App for issue triage related actions (#39635)

.github/workflows/issue-commented.yml

@@ -5,20 +5,22 @@ on:
     types:
       - created
 
-permissions:
-  contents: read
+permissions: {}
 
 jobs:
   issue-commented:
     name: Remove blocked/need-repro on comment
     if: ${{ contains(github.event.issue.labels.*.name, 'blocked/need-repro') && !contains(fromJSON('["MEMBER", "OWNER"]'), github.event.comment.author_association) }}
-    permissions:
-      issues: write
     runs-on: ubuntu-latest
     steps:
+      - name: Generate GitHub App token
+        uses: electron/github-app-auth-action@cc6751b3b5e4edc5b9a4ad0a021ac455653b6dc8 # v1.0.0
+        id: generate-token
+        with:
+          creds: ${{ secrets.ISSUE_TRIAGE_GH_APP_CREDS }}
       - name: Remove label
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ steps.generate-token.outputs.token }}
           ISSUE_URL: ${{ github.event.issue.html_url }}
         run: |
           gh issue edit $ISSUE_URL --remove-label 'blocked/need-repro'