collab: Make `admin` column non-nullable on `users` table (#36307)
This PR updates the `admin` column on the `users` table to be
non-nullable.
We were already treating it like this in practice.
All rows in the production database already have a value for the `admin`
column.
Release Notes:
- N/A
5620e359afMarshall Bowers committed on 8/16/2025, 1:09:14 PM· committed by GitHubparent6f2e7c3