Failed to compile onnx.Resize with dynamic shapes

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Got the following error when lowering onnx.Resize with dynamic shapes.
> error: failed to legalize operation 'arith.sitofp' that was explicitly marked illegal

Reproducer:
```
func.func @repro(%arg0: !torch.vtensor<[?,1280,?,?],f32>, %arg1: !torch.vtensor<[4],f32>) -> !torch.vtensor<[?,1280,?,?],f32> attributes {torch.onnx_meta.ir_version = 9 : si64, torch.onnx_meta.opset_version = 19 : si64, torch.onnx_meta.producer_name = "backend-test", torch.onnx_meta.producer_version = ""} {
%none = torch.constant.none
%0 = torch.operator "onnx.Resize"(%arg0, %none, %arg1) {torch.onnx.coordinate_transformation_mode = "asymmetric", torch.onnx.mode = "nearest", torch.onnx.nearest_mode = "floor"} : (!torch.vtensor<[?,1280,?,?],f32>, !torch.none, !torch.vtensor<[4],f32>) -> !torch.vtensor<[?,1280,?,?],f32>
return %0 : !torch.vtensor<[?,1280,?,?],f32>
}
```
Commands:
```
torch-mlir-opt --torch-onnx-to-torch-backend-pipeline --convert-torch-to-linalg repro.mlir -o repro_linalg.mlir
iree-compile --iree-hal-target-backends=llvm-cpu --iree-llvmcpu-target-cpu=host repro_linalg.mlir -o test.vmfb
```

It's failing at https://github.com/llvm/torch-mlir/blob/main/lib/Conversion/TorchToLinalg/Uncategorized.cpp#L3187 when trying to convert the dynamic input shape to float for multiplying with scales.

Start in lib/Conversion/TorchToLinalg/Uncategorized.cpp at the reported line around 3187, then reproduce the failure with the provided torch-mlir-opt and iree-compile commands and MLIR input. Trace the onnx.Resize lowering where the dynamic input shape is converted to float for scale multiplication. Done means the reproducer no longer fails on the explicitly illegal arith.sitofp operation.

Written by the indexing model from the issue text.