test: add unflatten_dense_tensors NPU coverage-pytorch-AtomGit

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已合并

test: add unflatten_dense_tensors NPU coverage #41632

yulin520创建于 7月14日从weixin_65332823/pytorch： test-unflatten-dense-tensors-npu-v271-issue2862 合入到 Ascend/pytorch： v2.7.1

test: add unflatten_dense_tensors NPU coverage #41632

已合并

yulin520创建于 7月14日

从weixin_65332823/pytorch test-unflatten-dense-tensors-npu-v271-issue2862合入到Ascend/pytorch v2.7.1