graphql: Add RepoCount to ExternalServices
Created by: ryanslade
It returns the number of repos currently synced by an external service.
Closes: https://github.com/sourcegraph/sourcegraph/issues/16729
Created by: ryanslade
It returns the number of repos currently synced by an external service.
Closes: https://github.com/sourcegraph/sourcegraph/issues/16729