Re-enable test_worker_update_metadata

This was testing some things that seeminly weren't even plumbed through
in Zuul v2.5 except for in the fake build. Removing them from the model
and support commands as well. We can always add back in the things we
need.

Change-Id: I47ee260e2e0a1cb5350b2f22a9b4c61dd1521aae
Story: 2000773
Task: 4617
4 files changed