[WebNN] Update usage of MLTensor to align with latest spec

[Honry]

Remove deprecated 'numThreads' option BTW.

[Honry]

@fdwr, @guschmue, PTAL, thanks!

cc// @ibelem

[fdwr]

👀

[fdwr]

/azp run ONNX Runtime Web CI Pipeline,Windows GPU CI Pipeline,Linux Android Emulator QNN CI Pipeline

[fdwr]

/azp run Linux CPU CI Pipeline,Linux CPU Minimal Build E2E CI Pipeline,Linux GPU CI Pipeline,Linux GPU TensorRT CI Pipeline,Linux OpenVINO CI Pipeline,Linux QNN CI Pipeline,MacOS CI Pipeline,Windows ARM64 QNN CI Pipeline,Windows CPU CI Pipeline

[fdwr]

/azp run Windows GPU CUDA CI Pipeline,Windows GPU DML CI Pipeline,Windows GPU Doc Gen CI Pipeline

[fdwr]

/azp run Windows GPU TensorRT CI Pipeline,onnxruntime-binary-size-checks-ci-pipeline,orttraining-linux-ci-pipeline,orttraining-linux-gpu-ci-pipeline,orttraining-ortmodule-distributed,Windows x64 QNN CI Pipeline,Big Models

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.

[Honry]

@fdwr, thank you for your review! Comments addressed, PTAL again, thanks!

[fdwr]

👍

[fdwr]

Check for broken links
https://microsoft.github.io/Olive/features/cli.html failed: 404 No error

https://github.com/microsoft/onnxruntime/actions/runs/12133242537/job/33872573345?pr=22959

Never mind - it's on an unrelated page to your change "_site/docs/genai/tutorials/finetune.html".