Replace calls to repo-updater InsertRepos to RepoStore Create
Created by: asdine
This replaces all the calls to repo-updater's Store#InsertRepos method from outside of repo-updater. These calls were replaced by the internal/db/RepoStore#Create
method.
Note: This PR is the first of many small changes that will progressively decouple repo-updater from the rest of the code.
Fixes #14711