Stop and clean CDDS workflows

Following #354, if a CDDS workflow does not succeed, it must be stopped and cleaned before attempting to re-run CMEW.

**Acceptance criteria**

- **Given** a working CMEW workflow
- **When** a CDDS workflow fails
- **And** the `standardise_model_data` job fails
- **Then** the `housekeeping` job stops and cleans all CDDS workflows

Note: The `housekeeping` task currently runs at the end of the workflow, but could be run after `restructure_dirs` (since it only cleans up CDDS-related data), and will need to be run for each `dataset`.

Trace the CDDS workflow and its existing housekeeping task, paying attention to the standardise_model_data and restructure_dirs steps. Verify how housekeeping is scheduled and how datasets are iterated; done means a failed standardise_model_data run stops and cleans all CDDS workflows before CMEW can be rerun.

Written by the indexing model from the issue text.