repo-updater: Convert the Store to use basestore
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Created by: asdine
Convert the cmd/repo-updater/internal.Store store created by https://github.com/sourcegraph/sourcegraph/issues/14714 to extend the basestore.Store
Extracted from https://github.com/sourcegraph/sourcegraph/issues/14092 and https://github.com/sourcegraph/sourcegraph/issues/11676