[Anthony Kim (anthonykim1)]

Follow-up to: https://github.com/microsoft/vscode-engineering/pull/4324

• Select npm 11.6.3 for node-pty's Azure Artifacts publishing step.
• Keep Node.js 24.22.1 for compile, package, API-scan, and Publish jobs.
• Satisfy node-pty's strict npm 11.6.3 minimum without changing the shared template's 11.6.0 default for other repositories.
• Preserve public npm publication, package construction, authentication, tags, and approval behavior.
• Unblock mirroring node-pty@1.2.0-beta.17, which is already available from npm, to Azure Artifacts.
• Validate publish.yml with git diff --check and Ruby YAML parsing.

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Inspirations from:

• The package-level opt-in uses publishNpmVersion from https://github.com/microsoft/vscode-engineering/pull/4324.
• The selected npm version matches node-pty's strict devEngines.packageManager.
• The missing opt-in is reproduced in publish build 488251, where the backward-compatible npm 11.6.0 default is rejected before Azure Artifacts publication.