This is almost the same fixture as sample_data except:
- it's BaseModel object instances within
- unfortunately, not complete as we cannot convert yet the metadata objects
(there is a diff pending [1] which will allow it but right now we cannot).
The next commits [2] will use this fixture to allow:
- the switch from dict to model objects.
- drop the validation proxy
- expose "sample_data" with model objects directly (and drop
sample_data_model) [3]
[1] D3456
[2] D3510
[3] In the mean time, hopefully the change about the metadata model objects
will have happened