WS-651: catches and saves RH CARTA event

• implemented lookup_capability_request_version
• implemented on_carta_ready
• added tests
• Black reformatting

shared/workspaces/test/test_capability_service.py

@@ -42,7 +42,7 @@ class TestCapabilityService:
         (request,) = mock_capability_info.save_entity.call_args.args
         assert request.ingested is True
 
-    @pytest.mark.skip("Broken due to queue/messenger rework?")
+    @pytest.mark.skip("As above, broken due to queue/messenger rework?")
     def test_on_carta_ready(
         self,
         mock_capability_service: CapabilityService,