Created by: camdencheek
This replaces the last instances of basestore.NewWithDB() and removes the function. Instead of constructing stores from a dbutil.DB interface, now we construct stores using other shareable handles or from transactable handles directly.
basestore.NewWithDB()
dbutil.DB
Depends on https://github.com/sourcegraph/sourcegraph/pull/36924 (sorry for the weird dependency. I had a couple of branches going. Will rebase once that's merged)
Unit tests.
Push commits to the source branch or add previously merged commits to review them.
