Cloud Build now supports uploading generic artifacts to generic

## Feature Feature Cloud Build now supports uploading generic artifacts to generic repositories, and also downloading generic repositories as build dependencies. For more information, see [genericArtifacts](https://cloud.google.com/build/docs/build-config-file-schema#generic-artifacts)and [Specify a generic artifact as a dependency](https://cloud.google.com/build/docs/building/manage-dependencies#specify-generic).