backend: Add request as parameter to json_success.

Adds request as a parameter to json_success as a refactor towards
making `ignored_parameters_unsupported` functionality available
for all API endpoints.

Also, removes any data parameters that are an empty dict or
a dict with the generic success response values.

zerver/webhooks/delighted/view.py

@@ -49,4 +49,4 @@ def api_delighted_webhook(
     topic = "Survey response"
 
     check_send_webhook_message(request, user_profile, topic, body)
-    return json_success()
+    return json_success(request)