[ONNX] Update export report formatting

1. The ordering of 

```
❌ Obtain model graph with `torch.export.export`
❌ Obtain model graph with `torch.export.export(..., strict=False)`
❌ Obtain model graph with `torch.jit.trace`
```

needs to be updated to show strcit=False first

2. Isolate run_decomposition into a separate step