Set up the trait dataset type correctly

* gn3/db/traits.py: setup `trait_dataset_type`
* tests/unit/db/test_traits.py: fix tests

  The type ('Temp', 'Geno', 'Publish', and 'ProbeSet') relate to a trait's
  dataset, and not the trait itself. This commit updates the code to take this
  into consideration.

  The dataset type is also set up from a trait's full name, therefore this
  commit removes the `trait_type` argument from the `retrieve_trait_info`
  function.

0 files changed, 0 insertions, 0 deletions