Fix Discord workflow: remove invalid is_remote parameter

- Remove undefined 'is_remote' parameter causing workflow failure
- Ensure Discord notifications work for PR events
- Fixes workflow startup failure on pull request events

Author: vaibhavdarji

.github/workflows/discord_notify.yml

@@ -9,7 +9,6 @@ jobs:
     uses: facebook/react/.github/workflows/shared_check_maintainer.yml@main
     with:
       actor: ${{ github.event.pull_request.user.login }}
-      is_remote: true
 
   notify:
     if: ${{ needs.check_maintainer.outputs.is_core_team == 'true' }}