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Geometry Nodes: Output the most complex attribute data type

In order to avoid losing information, it sometimes makes sense for the
output attribute type to depend on the types of the input attributes.

Such a function already exists, `attribute_data_type_highest_complexity`,
it just needs to be used in a few more places. The change for the attribute
compare node is just so the code there uses the same code style as in the
attribute mix node.

Addresses part of T83793
Differential Revision: https://developer.blender.org/D10099