remove most uses of deprecated GlobalUsers

Created by: camdencheek

This removes most uses of the deprecated database.GlobalUsers, replacing it with a db handle passed in from a parent scope. The goal here is to inject the database dependency into all code that uses it to facilitate mocking out database dependencies. The remaining handful of references to GlobalUsers require slightly more care to swap out, so I've left those for separate PRs so they can be reviewed individually.

Progresses #26112 (closed)