Simplify skips in parquet tests. (#7802)
Simplify skips in parquet tests. (#7802)

There already exist some Pytest markers, so there's no need to have a
second function that checks the condition again and adds a manual skip,
instead of decorating the functions with the marker.
jakirkham/dask,dask/dask,dask/dask,blaze/dask,jakirkham/dask,blaze/dask