Add device_settings to CI/CD test matrix

Include device_settings package in GitHub Actions workflow to run
the 14 new API tests (List, GetByID, Update operations).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: vinod-ship-it

.github/workflows/test.yml

@@ -25,6 +25,7 @@ jobs:
           - deployment_services
           - config_setup
           - config_operations
+          - device_settings
 
     steps:
       - name: Checkout code