Add some more generated metadata files

#1915 adds metadata generation (with stored expected results). We should expand the collection in two directions:

• The current metadata is basically all with default values: Add More variation on the metadata (different key types, delegations, targets, etc)
• Include actual repositories (that are confirmed to work as repositories), possibly with several versions of the same repository: Note that we should be careful not to duplicate the code in RepositorySimulator based updater tests: possibly we could just make RepositorySimulator generated data reproducible and store the results of the RepositorySimulator runs (see the --dump option for related tests)

I'll assign to myself: I'll probably handle the first item and file a new issue on the second but let's see...

Empieza leyendo #1915 y sus resultados de metadatos esperados almacenados para entender la colección generada actual. Después, inspecciona RepositorySimulator y la opción --dump en las pruebas relacionadas, ya que, como sugiere el issue, pueden proporcionar datos de repositorio reproducibles. Se considera completado cuando se amplía la variación de metadatos y se consideran ejemplos confirmados de repositorios sin duplicar los datos de updater-test.