Property collection functions were not really in sync which could result
in crashes in UI_LISTS.
The reason is that attributes of type color defined on domains other than
Points or Corners are still valid, but should really be skipped for the
special "color_attributes".
`rna_AttributeGroup_color_length` itself was fine here, it skips these,
but the iterator (`rna_AttributeGroup_color_iterator_begin` /
`rna_Attributes_noncolor_layer_skip`) wasnt, so when a UI_LIST
filter_items() would iterate the collection it would actually get
results were it shouldnt.
Now check a suiting domain in `rna_Attributes_noncolor_layer_skip` as
well.
Maniphest Tasks: T97502
Differential Revision: https://developer.blender.org/D14717
f6d5d01715