Blender Git Loki

Geometry Nodes: Remove repeated instance attribute names in search

This commit makes sure that each attribute name is only added once
when logging geometry values for attribute search.

The `attribute_foreach` function for a single geometry component
deduplicated names, but a much more common situation is to have
more than one component in the instances of a geometry set.

Differential Revision: https://developer.blender.org/D12959