Tests for CheckUser that are run as part of the gated extensions tests need to reference two string constants in CentralAuthUser. While the string constant could be written out manually it is desirable to not do this in case the raw value of these constants are changed. Without CentralAuth in the gated extensions list CentralAuthUser is not accessible to CheckUser tests when running the gated extension tests.
For the time being I will write the string values in manually as the test does not rely on CentralAuth for any purpose.