Trigger children tasks update on worker activity errors

Refs https://gitlab.com/arkindex/requests/-/issues/467

In the UpdateWorkerActivity endpoint, if the new state is error and update_count > 0, then a follow up update should be triggered to update all follow up tasks on the same element: ie. all worker activity on that element where state is queued (disregard worker versions & configurations).

This will prevent that follow-up tasks (like kaldi after ufcn) to run on a bad output.