GAR integrations: Implement configuration test for the project integration
Description
We have been implementing the new project integration GoogleCloudPlatform::ArtifactRegistry
without the configuration test Add GoogleCloudPlatform::ArtifactRegistry integ... (!141127 - merged)
In order to implement the integration test, the client class needs to be able to retrieve the repository details.
When the refactoring of the client class is done GAR Integration: Custom client class (#425147 - closed) we could go ahead and implement the configuration test.