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/statuspage/view.py

@@ -73,4 +73,4 @@ def api_statuspage_webhook(
         raise UnsupportedWebhookEventType("unknown-event")
 
     check_send_webhook_message(request, user_profile, topic, body, event)
-    return json_success()
+    return json_success(request)