ci: add develop/** branch trigger to pull-request workflow

Agent-Logs-Url: https://github.com/petesramek/polyline-algorithm-csharp/sessions/04ca3c24-1251-41b5-8421-0822cde95f54

Co-authored-by: petesramek <2333452+petesramek@users.noreply.github.com>

Author: Copilot

.github/workflows/pull-request.yml

@@ -8,8 +8,9 @@ on:
       - synchronize
       - reopened
     branches:
+      - 'develop/**'
       - 'preview/**'
-      - 'release/**' 
+      - 'release/**'
 
 permissions:
   actions: read