Rework creating mock IGoogleApiFactory

`RunOptionsDefaultsComponentTest` and `MiniSelectorTest`, and possibly others, mock up instances of `IGoogleApiFactory` for tests. Wiring up the responses is a bit tricky, and we're repeating code. And some of the services are inter-related, such as the _Services Management_ and _Cloud Resource Manager_ services, where they deal with the same projects. We should consolidate this information into a single mock factory, perhaps using a builder pattern.