L3 - Default AT:
- the roles & scope fields are removed from the get collection by id endpoint
- there should be no need anymore for the `ResolvedCollectionDefinitionDto` inside the `CollectionService` ideally we rename the `SimpleCollectionDefinitionDto` to just `CollectionDefinitionDto` that is not generic
- the rest api documentation is adjusted accordingly
Context:
With OPT-2880 the front-end is retrieving the roles from a dedicated endpoint and thus we should remove the unused field to simplify the endpoint. The scope was not accessed from the collection by id endpoint yet and will be accessed from a dedicated endpoint created with OPT-2848.