[browser] Validate npm 11.19.1 through Node and VMR packages

[kotlarmilos]

Description

This validates the npm 11.19.1 update in dotnet/node#396 through the standard runtime WASM PR pipelines. It updates all eight Node transports to 11.0.0-alpha.1.26457.5 from BAR 330858 and consumes Emscripten packages from VMR BAR 330868 through General Testing. The validation-only manifest-band override selects the published .NET 12-branded workload packages while retaining the existing .NET 11 SDK host and leaving global.json unchanged.

The official Node build succeeds at https://dev.azure.com/dnceng/internal/_build/results?buildId=3068942 and the official VMR build succeeds at https://dev.azure.com/dnceng/internal/_build/results?buildId=3069115. Publication at https://dev.azure.com/dnceng/internal/_build/results?buildId=3069257 completes package and blob publication but fails while downloading an SDK PDB. All required Emscripten packs and workload manifests are available in the testing feed. BAR 330868 is assigned to General Testing without repeating artifact publication.

This draft is for CI validation only and must not merge while it references General Testing.

Contributes to dotnet/node#396

Note

This pull request description and its changes were generated with GitHub Copilot.

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[kotlarmilos]

/azp run runtime-wasm

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