Weight Paint: use coordinates from normal evaluated mesh if same topology.

Weight and Vertex paint don't change coordinates and thus don't need
crazyspace data, which allows using coordinates from normal evaluated
meshes.

Since painting uses original topology, the deform only mesh is used,
but if the fully evaluated mesh has the same topology, it is preferred.
This is useful because not only Geometry Nodes, but even simple weight
computation modifiers are excluded from the deform only mesh evaluation.

Differential Revision: https://developer.blender.org/D15501

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