[ONNX] exporter native_layer_norm (#81754)
Pytorch has two similar layer normalization symbols `aten::layer_norm` and `aten::native_layer_norm`. This PR reuses `aten::layer_norm`'s exporter for exporting `aten::native_layer_norm` with a small refinement. A test is also included. This PR is required because JIT graphs generated from TorchDynamo and LazyTensor (with TS backend) may contain `native_layer_norm` instead of `layer_norm`.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/81754
Approved by: https://github.com/BowenBao, https://github.com/justinchuby
