[OVEP][NPU]compile model will hang all the time and never return when running model florence-2-base-vision-encoder-fp16 with OpenVINO-NPU

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### Describe the issue

When running florence-2-base-vision-encoder-fp16 model with onnxruntime_perf_test tool OpenVINO-NPU, it will hang in core.compile_model in https://github.com/microsoft/onnxruntime/blob/main/onnxruntime/core/providers/openvino/ov_interface.cc#L165 and never return, which blocks the program to run

### To reproduce

1. Build onnxruntime code with "--use_openvino" flag
2. Download florence-2-base-vision-encoder-fp16 from https://huggingface.co/onnx-community/Florence-2-base/blob/main/onnx/vision_encoder_fp16.onnx
3. Run command "onnxruntime_perf_test.exe -I -r 50 -e openvino -i "device_type|NPU" -f batch_size:1 -f height:768 -f width:768 vision_encoder_fp16.onnx"

### Urgency

_No response_

### Platform

Windows

### OS Version

Win11

### ONNX Runtime Installation

Built from Source

### ONNX Runtime Version or Commit ID

977efe4788b2ee24371523b5fa14dd02efcd4942

### ONNX Runtime API

C++

### Architecture

X64

### Execution Provider

OpenVINO

### Execution Provider Library Version

OpenVINO 2025.3