Drop DataSource handling

Closes #29 (closed)

• Removes arkindex_worker.worker.MANUAL_SLUG
  • No workers affected in teklia/workers
• Removes ElementsWorker.get_ml_result_slug
  • Affects generic_exporter (here, here, here, here)
  • Affects horae_exporter (here and here)
  • Affects balsac_exporter (here, here and here)

arkindex_worker/worker/__init__.py

@@ -16,7 +16,7 @@ from arkindex_worker.worker.element import ElementMixin
 from arkindex_worker.worker.entity import EntityMixin, EntityType  # noqa: F401
 from arkindex_worker.worker.metadata import MetaDataMixin, MetaType  # noqa: F401
 from arkindex_worker.worker.transcription import TranscriptionMixin
-from arkindex_worker.worker.version import MANUAL_SLUG, WorkerVersionMixin  # noqa: F401
+from arkindex_worker.worker.version import WorkerVersionMixin  # noqa: F401
 
 
 class ActivityState(Enum):