Revert feature-branch deploy trigger

Author: CarsonL15

.github/workflows/AdminWebpage-Deploy-WF.yml

@@ -7,10 +7,7 @@ name: AdminWebpage-Deploy-WF
 on:
   workflow_dispatch:
   push:
-    # TODO: drop `admin-and-maintenance-app` from this list before merging to main.
-    # It's only here so the workflow can be exercised end-to-end from the feature
-    # branch without merging first.
-    branches: [main, admin-and-maintenance-app]
+    branches: [main]
     paths:
       - "admin-webapp/**"
       - "Iac/admin-webapp/**"