Node interop: Add handling for redirect URI based on platform

[shylasummers]

v5 version of #7908

[Copilot]

Pull Request Overview

This PR implements platform-specific redirect URI handling for the native broker plugin in the MSAL Node Extensions library. The change enables the broker to use appropriate redirect URIs based on the operating system platform.

• Adds a new private method chooseRedirectUriByPlatform that returns platform-specific redirect URIs
• Updates both acquireTokenSilent and acquireTokenInteractive methods to use platform-specific redirect URIs
• Removes the msal-node-extensions sample application directory and files

Reviewed Changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 6 comments.

File	Description
extensions/msal-node-extensions/src/broker/NativeBrokerPlugin.ts	Implements platform-specific redirect URI logic and refactors token acquisition methods
extensions/msal-node-extensions/test/broker/NativeBrokerPlugin.spec.ts	Adds comprehensive test coverage for redirect URI handling across all platforms
extensions/samples/msal-node-extensions/*	Removes sample application files (package.json, index.js, CHANGELOG.json, .npmrc, .beachballrc)