For operations at instance level (Instances list or Instance detail) we now have a new endpoint:
http://localhost:8080/swagger-ui.html#/Workflow%20instances/batchOperationUsingPOST_1 - incidentId can be null
This new endpoint allows us to know if an operation was successfully started or not.
That's why we only show the spinner if the operation was started successfully.
For batch operations (operations started in selections) we will continue using the current endpoint.