Missing consistency on Import of Tag Groups

Current Behaviour

• Assume a workflow being assigned a Tag Group, for example : FOO:BAR
• When exporting the workflow, we find the "workflow.tags.json" file being created that holds the FOO:BAR Tag Group and Tag.
• When we import the export zip file, the workflows are imported and Tags are imported . The Tag Group is separately imported but is no longer related to Tags .

Desired Behaviour

• On import of Tag Groups and Tags the relationship between Tag Group and Tag should remain in place.

Maintainer Note

• The import doesn't change the group-tag relationship for tags that already exist in the target system.
• Only new tags get the group-tag relationship as specified