Describe the issue

As title.

The WebGPU EP's ConvTranspose operator neglects to check if the bias is of the expected shape. See tests added in #27209. The WebGPU EP "passes" those tests when a failure of some sort is expected (preferably along the lines of bias is not of the expected shape). Not sure if this is masking a bug of some sort.

To reproduce

Run tests in #27209 with the WebGPU EP

Urgency

Not urgent

ONNX Runtime Installation

Built from Source

ONNX Runtime Version or Commit ID

Run tests in PR branch #27209

Execution Provider

'webgpu' (WebGPU)