[ONNX] Update logic for folding onnx::Constant nodes. #20109
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Currently, constant folding pass during ONNX conversion removes all onnx::Constant nodes that are parents of nodes that are folded. In situations where the parent onnx::Constant node is other subscribers downstream this could be a problem. This change updates the removal logic to remove to only those onnx::Constant nodes that do not have other subscribers downstream