[ci] Use shared maintainer check for discord notifications

Uses the shared maintainer check workflow across the various workflows that need it

.github/workflows/compiler_discord_notify.yml

@@ -1,15 +1,18 @@
 name: (Compiler) Discord Notify
 
 on:
-  pull_request_target:
-    types: [labeled]
+  pull_request:
     paths:
       - compiler/**
       - .github/workflows/compiler_**.yml
 
 jobs:
+  check_maintainer:
+    uses: facebook/react/.github/workflows/shared_check_maintainer.yml@main
+
   notify:
-    if: ${{ github.event.label.name == 'React Core Team' }}
+    if: ${{ needs.check_maintainer.outputs.is_core_team }}
+    needs: check_maintainer
     runs-on: ubuntu-latest
     steps:
       - name: Discord Webhook Action

.github/workflows/runtime_discord_notify.yml

@@ -1,15 +1,18 @@
 name: (Runtime) Discord Notify
 
 on:
-  pull_request_target:
-    types: [labeled]
+  pull_request:
     paths-ignore:
       - compiler/**
       - .github/workflows/compiler_**.yml
 
 jobs:
+  check_maintainer:
+    uses: facebook/react/.github/workflows/shared_check_maintainer.yml@main
+
   notify:
-    if: ${{ github.event.label.name == 'React Core Team' }}
+    if: ${{ needs.check_maintainer.outputs.is_core_team }}
+    needs: check_maintainer
     runs-on: ubuntu-latest
     steps:
       - name: Discord Webhook Action

.github/workflows/shared_core_label.yml → .github/workflows/shared_check_maintainer.yml

@@ -1,20 +1,25 @@
-name: (Shared) Core Label
+name: (Shared) Check maintainer
 
 on:
-  pull_request:
+  workflow_call:
+    outputs:
+      is_core_team:
+        value: ${{ jobs.check_maintainer.outputs.is_core_team }}
 
 env:
   TZ: /usr/share/zoneinfo/America/Los_Angeles
   # https://github.com/actions/cache/blob/main/tips-and-workarounds.md#cache-segment-restore-timeout
   SEGMENT_DOWNLOAD_TIMEOUT_MINS: 1
 
 jobs:
-  core_label:
+  check_maintainer:
     runs-on: ubuntu-latest
+    outputs:
+      is_core_team: ${{ steps.check_if_actor_is_maintainer.outputs.result }}
     steps:
       - uses: actions/checkout@v4
       - name: Check if actor is maintainer
-        id: check_maintainer
+        id: check_if_actor_is_maintainer
         uses: actions/github-script@v7
         with:
           script: |
@@ -28,14 +33,3 @@ jobs:
             }
             console.log(`🔴 ${actor} is NOT a maintainer`);
             return null;
-      - name: Label PR as React Core Team
-        if: ${{ steps.check_maintainer.outputs.result }}
-        uses: actions/github-script@v7
-        with:
-          script: |
-            github.rest.issues.addLabels({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: ${{ github.event.number }},
-              labels: ['React Core Team']
-            });

.github/workflows/shared_label_core_team_prs.yml

@@ -0,0 +1,29 @@
+name: (Shared) Label Core Team PRs
+
+on:
+  pull_request:
+
+env:
+  TZ: /usr/share/zoneinfo/America/Los_Angeles
+  # https://github.com/actions/cache/blob/main/tips-and-workarounds.md#cache-segment-restore-timeout
+  SEGMENT_DOWNLOAD_TIMEOUT_MINS: 1
+
+jobs:
+  check_maintainer:
+    uses: facebook/react/.github/workflows/shared_check_maintainer.yml@main
+
+  label:
+    if: ${{ needs.check_maintainer.outputs.is_core_team }}
+    runs-on: ubuntu-latest
+    needs: check_maintainer
+    steps:
+      - name: Label PR as React Core Team
+        uses: actions/github-script@v7
+        with:
+          script: |
+            github.rest.issues.addLabels({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: ${{ github.event.number }},
+              labels: ['React Core Team']
+            });