No UndoRedo inspector hook callback on multiple simultanious edits. about godot HOT 2 OPEN

After looking at the ways Godot uses add_undo_redo_inspector_hook_callback() internally, I can confirm that none of the internal uses of this function should be effected by this fix given that multi node editing currently does not apply to Resources like Material3D, and TileSet. #91843

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After thinking on this further, I think making this return A callback for each edit in A multi node edit would make this callback fall out of sync with how UndoRedo is assigned when multi editing nodes which feels wrong based on its description in the docs.

Having MultiNodeEdit itself return A single callback with info that can be used to query the changes made would be both more in line with the single do\undo added to UndoRedoManager by MultiNodeEdit when editing multiple nodes, and would require specific handling in plugins to be able to react to MultiNodeEdits theoretically ensuring that no uses of add_undo_redo_inspector_hook_callback() are effected by these changes at all.

I think this is the least impactful way to fix the inability to react to editing multiple nodes in the inspector the way, "Hooks a callback into the undo/redo action creation when a property is modified in the inspector." implies in the docs.

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