This addresses issue #93052.
Now converting the USD "varying" interpolation type to
the "point" domain type when importing USD attributes.
There have been some inconsistent opinions in the USD
developer community about whether "varying" interpolation
is equivalent to "corner" or "point" domains for meshes.
However, DCCs such as Unity and Houdini assume that the
number of entries for attributes with "varying" interpolation
is the same as the number of points, and this change allows
Blender to import such assets without error.
Michael Kowalski