[WebGPU] Disable automatic subgroup MatMul selection on gen-12hp - #33913

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: microsoft/onnxruntime-github-actions/setup-build-tools@d19341fb036c43a947a2c0e4a53ad4d15e10bc5c, nuget/setup-nuget@d105a947828025cd7a980103c35ba2bfae586d0f. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/