[ci] fix notify for forks (#7694)

Author: rickhanlonii

.github/workflows/discord_notify.yml

@@ -1,7 +1,7 @@
 name: Discord Notify
 
 on:
-  pull_request:
+  pull_request_target:
     types: [opened, ready_for_review]
 
 permissions: {}

.github/workflows/label_core_team_prs.yml

@@ -1,7 +1,7 @@
 name: Label Core Team PRs
 
 on:
-  pull_request:
+  pull_request_target:
 
 permissions: {}