Fix ordering of value info in GraphProto creation (#20691)
### Description
Graph member value_info_ (unordered_set) is ordered before its values
are added to the graph proto.
### Motivation and Context
- Without this ordering, the model proto used by the OpenVINO EP is not
deterministic and varies across runs.
- Since the model proto varies, it affects caching attempts by OpenVINO.
Q: If creating a vector to have ordered elements is costly, should we
make value_info_ a std::set that is sorted according to NodeArg names?
Related PR about ordering initializers:
https://github.com/microsoft/onnxruntime/pull/14631
