[WebNN EP] Support reshape and expand with 0d input and 0d output #22215
Description
Describe the issue
A scalar input to a scalar output should be valid nop for reshape and expand.
To reproduce
Run onnx model with reshape or expand, the input and output are both 0d scalar on WebNN EP.
Urgency
No response
ONNX Runtime Installation
Built from Source
ONNX Runtime Version or Commit ID
Execution Provider
Other / Unknown