dws: Fix NnfDataMovement logging

[bdevcich]

Problem: No NnfDataMovement resources are found when dumping to the journal. The current implementation is only looking at the default namespace instead of all namespaces. Additionally, the output is valid json.

• Changed the api call to use list_cluster_custom_object to retrieve objects from all namespaces
• Deleted DATAMOVEMENT_CRD since namespace cannot be used for list_cluster_custom_object
• Moved NnfDatamovement retrieval to before the transition to TearDown. Otherwise these will start to be removed.

[bdevcich]

@jameshcorbett Let's try this again. I cleaned up my commits to follow the style requirements (and updated the PR title/description).

[bdevcich]

Also, I did run black on my changes, but it did not flatten the from flux_k8s.crd import WORKFLOW_CRD line (like it did for you) for some reason.