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/bitbucket3/view.py

@@ -416,4 +416,4 @@ def api_bitbucket3_webhook(
             unquote_url_parameters=True,
         )
 
-    return json_success()
+    return json_success(request)