database: Remove manual check for duplicate services
Created by: ryanslade
A DB constraint was already added. (Thanks @miveronese!)
Closes https://github.com/sourcegraph/sourcegraph/issues/19878
Test plan
Tests updated
Created by: ryanslade
A DB constraint was already added. (Thanks @miveronese!)
Closes https://github.com/sourcegraph/sourcegraph/issues/19878
Tests updated