onnxruntime

19614f05 - Avoid empty temp external initializer file creation inside the call (#25188)

Avoid empty temp external initializer file creation inside the call (#25188) ### Description While EPContext model generation is enabled and some Nodes fallback on CPU. If the CPU nodes depend on external data. ORT force all external data to be embedded into new generated EPContext model by default. Ort used to create a dummy externa initializer file with maximum size threshold to force all initializer data dump into generated Onnx model file. Internally, a "./model_ext_ini.bin" file is created and got removed at the end of the call. It causes problem if multiple session doing the same thing. This fix is to avoid creating the temp empty external initializer file by adding a flag to force all external data to be embedded into new generated EPContext model.