WS-740: eliminate single-implementation workflow interfaces

shared/workspaces/test/test_workflow_info.py

...s/workspaces/system/services/remote_processing_service.py

shared/workspaces/workspaces/system/views.py

shared/workspaces/workspaces/workflow/message_architect.py

shared/workspaces/workspaces/workflow/schema.py

shared/workspaces/workspaces/workflow/schema_interfaces.py

shared/workspaces/workspaces/workflow/services/interfaces.py

.../workspaces/workspaces/workflow/services/workflow_info.py

...rkspaces/workspaces/workflow/services/workflow_service.py

testing/testing/utils/conftest.py