Fix non-deterministic constant folding output (#29789)
### Description
From `v1.24.1`, `use_tensor_buffer=true` is set in `TensorToTensorProto`
during constant folding. For ops that return aliased OrtValues (e.g.
Reshape), the folded initializer referenced memory owned by an input
initializer. When that input was removed later in the pass, the
reference dangled, producing unstable (often huge/negative) values.
Use `out_tensor.OwnsBuffer()` to decide `use_tensor_buffer`. Owned
tensors are referenced zero-copy (safe via `OrtValue` shared lifetime);
aliased tensors are deep-copied into the proto
### Related issue
https://github.com/microsoft/onnxruntime/issues/29788
