Description
Throughout orchestrator, error conditions should add metadata instead of replacing existing Z22s.
Desired behavior/Acceptance criteria (returned value, expected error, performance expectations, etc.)
- add metadata instead of replacing existing Z22s;
- relax requirement that a function must return either Z221 OR "errors" metadata BUT NOT both
Completion checklist
- Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Back-end_Task/Bug_completion_checklist