Disable streams for the DML EP (#19481)
There's currently a bug in the allocation planner when reusing buffers
and more than one streams are used that make it possible (although
rarely) to reach a reference count of 0 for a buffer that is still being
used. Since DML doesn't benefit from multiple streams, disabling it is
the safest option for now.
This is a high priority issue that we need to fix for 1.17.1 since it
breaks stable diffusion. Identifying the perfect fix and fixing the
underlying issue would be too risky for a patch release, especially
given the limited time that we have.
https://github.com/microsoft/onnxruntime/issues/19480
