[QNN EP] Fix compile error for QNN EP on Windows x64 due to missing /bigobj flag (#21795)
### Description
Compiling onnxruntime with QNN EP on Windows x86_64 results in a
compilation error:
```shell
$ onnxruntime\test\optimizer\qdq_transformer_test.cc(1,1): error C1128: num
ber of sections exceeded object file format limit: compile with /bigobj [...onnxruntime\build\Debug\onnxruntime_test_all.vcxproj]
```
This PR adds the `/bigobj` compilation flag for the
`qdq_transformer_test.cc` file.