Add pytest-accept to a pixi developer environment

[Illviljan]

Is your feature request related to a problem?

pytest-accept is quite important for generation aggregations and quickly fixing changes in doctests.

For example: https://github.com/pydata/xarray/blob/58594f81913c593a722ecd40fe4ea2f149d7baec/xarray/util/generate_aggregations.py#L1-L14

Describe the solution you'd like

Add pytest-accept to a pixi developer environment since it really isn't necessary for CI testing.

Describe alternatives you've considered

No response

Additional context

No response

[keewis]

I agree, we might need a dev environment that contains the full test env plus additional tools like pytest-accept or ipython/ipdb/black (and quite possibly another one that does include the typing feature).

[Illviljan]

Being new to pixi as well, I think also it would be nice for new contributors to only have to run pixi shell -e dev to get a working dev environment