feat: add turbo repo to node gitignore

[maddhruv]

Reasons for making this change

Turbo Repo is a widely used node monorepo tool used with various frameworks and packages.
The .turbo directory contains build artifacts, logs, and cache data generated locally by the Turborepo CLI. Adding .turbo to .gitignore prevents accidental commits of large or irrelevant files, keeps the repository clean, and follows the official Turborepo recommendation for managing this directory.

Links to documentation supporting these rule changes

• turborepo guide on ignore the .turbo directory - https://turborepo.com/docs/getting-started/add-to-existing-repository#edit-gitignore

If this is a new template

Not applicable. This is an update to an existing template.
Link to application or project’s homepage: https://turborepo.com/docs/getting-started/add-to-existing-repository#edit-gitignore

Merge and Approval Steps

• Confirm that you've read the contribution guidelines and ensured your PR aligns
• Ensure CI is passing
• Get a review and Approval from one of the maintainers

[Copilot]

Pull Request Overview

This PR adds Turbo Repo support to the Node.js gitignore template by excluding the .turbo directory from version control. Turbo Repo is a popular monorepo build system that generates build artifacts, logs, and cache data in this directory.

• Adds .turbo directory to the Node.js gitignore template
• Includes a descriptive comment identifying the Turbo Repo section
• Follows official Turborepo documentation recommendations

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[maddhruv]

Hey @dooleydevin please have a look
TIA :)