comparer where does not filter raw_data

cmp_2m = cmp.where(cmp.data['z']==-2).rename({cmp.name: "1m"})

cmp_2m.raw_model_results contains all z levels

https://github.com/DHI/modelskill/blob/c50518cecdea0ccf1fe7239848728e593b8af7b3/src/modelskill/comparison/_comparison.py#L912-L914

This is an issue if we want to plot timeseries for the comparer.

cmp_2m.plot.timeseries()

will plot all model depths