Update SWA workflow: skip builds, adjust output_location

Changed output_location to empty string for pre-built upload.
Added skip_api_build and skip_app_build to bypass build steps.

Author: gvreddy04

.github/workflows/azure-static-web-app.yml

@@ -62,7 +62,7 @@ jobs:
           action: "upload"
           app_location: "output/wwwroot" # Path to your .csproj folder
           api_location: "" # Leave empty if no API
-          output_location: "output/wwwroot" 
+          output_location: "" # Leave empty when using 'upload' action with a pre-built app
           skip_api_build: true
           skip_app_build: true