docs: add Node.js (LTS) and Yarn pre-install step to Frontend Setup

[Prasanjeet-Microsoft]

Purpose

• This pull request updates the local setup documentation to clarify the prerequisites for installing dependencies. The instructions now explicitly guide users to install Node.js (LTS) and Yarn before running yarn install, reducing potential setup issues for new developers.

Documentation improvements:

• Added detailed steps to verify and install Node.js (LTS) and Yarn before installing dependencies in docs/LocalSetupGuide.md, including recommended versions and verification commands.
• Adjusted step numbering to accommodate the new prerequisite instructions, ensuring a clear and logical setup flow.

Does this introduce a breaking change?

• Yes
• No

What to Check

Verify that the following are valid:

• Only LocalSetupGuide.md was changed.
• New Node.js (LTS) + Yarn step appears before “Install dependencies” and numbering is correct.
• Windows-friendly PowerShell commands present (winget/npm/corepack) and a link to https://nodejs.org.
• Verification command(s) included or a one-line combined alternative.
• Markdown renders correctly, no typos, and it’s a documentation-only change.

[github-actions]

🎉 This PR is included in version 1.1.1 🎉

The release is available on GitHub release

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