onnxruntime

Fix Reshape check (#16349)

### Fix Reshape check

3D->2D reshape by merging the first dims. 

There is a bug for the case. 

```mermaid
stateDiagram
    [768,12,64] --> Reshape
    (—1,768) --> Reshape
   Reshape --> [768,768]
```
   


The Reshape pass the upstream Reshape check, but it should not. 

### Motivation and Context
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