Fix T97502: Issues/crashes with "color_attributes" AttributeGroup

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

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