[crag] use non-Nothing inputs in crag toys
Summary: Ben found the everywhere-Nothing inputs a little confusing, and I separately had to provide non-Nothing inputs to reproduce a user issue with to_job and the default IO manager.
Test Plan: bk, run the event_tables job in local dagit
Reviewers: bengotow, cdecarolis
Reviewed By: bengotow
Differential Revision: https://dagster.phacility.com/D9187