[ci] Update discord notification bot to use remote workflow (#7455)

Author: poteto

.github/workflows/discord_notify.yml

@@ -2,11 +2,18 @@ name: Discord Notify
 
 on:
   pull_request_target:
-    types: [ labeled ]
+    types: [labeled]
 
 jobs:
+  check_maintainer:
+    uses: facebook/react/.github/workflows/shared_check_maintainer.yml@main
+    with:
+      actor: ${{ github.event.pull_request.user.login }}
+      is_remote: true
+
   notify:
-    if: ${{ github.event.label.name == 'React Core Team' }}
+    if: ${{ needs.check_maintainer.outputs.is_core_team == 'true' }}
+    needs: check_maintainer
     runs-on: ubuntu-latest
     steps:
       - name: Discord Webhook Action
@@ -18,4 +25,4 @@ jobs:
           embed-author-icon-url: ${{ github.event.pull_request.user.avatar_url }}
           embed-title: '#${{ github.event.number }} (+${{github.event.pull_request.additions}} -${{github.event.pull_request.deletions}}): ${{ github.event.pull_request.title }}'
           embed-description: ${{ github.event.pull_request.body }}
-          embed-url: ${{ github.event.pull_request.html_url }}
+          embed-url: ${{ github.event.pull_request.html_url }}