onnxruntime

cd9406bf - Refactor Webnn IsSupported*() to use constant initializers. (#24118)

Refactor Webnn IsSupported*() to use constant initializers. (#24118) ### Description <!-- Describe your changes. --> This PR continues the work started at https://github.com/microsoft/onnxruntime/pull/19401. ### Motivation and Context An overridable initializer should not have a fixed value included in an WebNN model as it could be changed at runtime. The current check doesn't include validating that the initializer is constant.