[DML EP] Fix FusedMatMul crash when batch > 1 (#14225)
### Description
Fix FusedMatMul crash when batch > 1
### Motivation and Context
FusedMatMul calls `SetStrides` on its input tensors but doesn't update
the tensorSizeInBytes value. Calling `SetStrides` is very error-prone
because it puts the tensor in an invalid state, and the caller needs to
manually adjust it after the call. To avoid this situation in the
future, we now update the size of the tensor in the `SetStrides` call
itself.
