This commit adds attribute search the the attribute input field node.
Because it's a field node, finding which attribute to display without
increasing the complexity a lot isn't obvious. In this commit, all
attributes used by nodes in the current group are included.
When an attribute is chosen from the list, the node's data type is
updated, and links connected to the output socket are reconnected.
Ref T96271
Differential Revision: https://developer.blender.org/D14516
3ecdfd0938