onnxruntime

dc876910 - Enable DML graph fusion independently of graph optimization level (#15172)

Enable DML graph fusion independently of graph optimization level (#15172) ### Description Apply the DML graph fusion transformer optimization independently of ORT graph optimization level. ### Motivation and Context The DML graph fusion transformer is not a graph optimizer in the normal sense: it isn't optimizing the ONNX graph structure, but rather fusing nodes into what will later become a single IDMLCompiledOperator (using IDMLDevice1::CompileGraph). This transformer can't be done ahead of time (hence why it's disabled if saving an optimized model), but it's also gated by the ORT graph optimization level; this makes it impossible to preoptimize ONNX models ("offline mode") and then later disable graph optimizations for better startup performance ("online mode") while benefiting from DML graph fusion.