Process activity state

...x/dataimport/migrations/0032_dataimport_activity_state.py

arkindex/dataimport/models.py

arkindex/dataimport/serializers/imports.py

arkindex/dataimport/tests/test_imports.py

arkindex/dataimport/tests/test_repos.py

arkindex/dataimport/tests/test_workeractivity.py

arkindex/dataimport/tests/test_workflows_api.py

arkindex/project/config.py

arkindex/project/tests/config_samples/defaults.yaml

arkindex/project/tests/config_samples/override.yaml