feat(ir): add typed builder for npmAuthenticate@0

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Summary

Adds a typed builder struct for npmAuthenticate@0 to the ado-aw IR.

Motivation

Previously, the Node.js runtime extension emitted the npmAuthenticate@0 step by hand-crafting TaskStep::new("npmAuthenticate@0", ...).with_input("workingFile", ".npmrc") with raw string keys. This PR introduces a typed builder struct (new(working_file) + typed optional setters + into_step()) so the required .npmrc path is positional, optional inputs (customEndpoint, azureDevOpsServiceConnection, feedUrl) are typed and checked, and call sites stop using stringly-typed keys.

Changes

• src/compile/ir/tasks/npm_authenticate.rs: new NpmAuthenticate builder struct with 8 #[cfg(test)] unit tests covering required input, default display name, optional inputs, and the full inputs-together scenario
• src/compile/ir/tasks/mod.rs: pub mod npm_authenticate; declaration (alphabetical, between npm and nuget_authenticate)
• src/runtimes/node/extension.rs: npm_authenticate_task_step() now calls NpmAuthenticate::new(".npmrc").with_display_name(...).into_step() instead of the raw TaskStep::new call

ADO Task Reference

• Task: npmAuthenticate@0
• Docs: https://learn.microsoft.com/en-us/azure/devops/pipelines/tasks/reference/npm-authenticate-v0
• Required inputs: workingFile — path to the .npmrc file to authenticate
• Optional inputs: customEndpoint (service connections for external registries), azureDevOpsServiceConnection / workloadIdentityServiceConnection (workload identity federation), feedUrl (Azure Artifacts feed URL; required when azureDevOpsServiceConnection is set)

Validation

• cargo build --all-targets
• cargo test
• cargo clippy --all-targets --all-features --workspace -- -D warnings

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