feat: export getVersion helper from @netlify/build

[pieh]

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Summary

Part of https://linear.app/netlify/issue/FRB-2141/cli-deploys-dont-set-netlifybuild-version-metadata

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Review failed

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 2b0e7187-afa5-4b35-9db9-5f5c8ec4ce50

📥 Commits

Reviewing files that changed from the base of the PR and between 6588f01 and 9697b1a.

📒 Files selected for processing (2)

• packages/build/src/index.ts
• packages/build/src/utils/json.ts

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📝 Walkthrough

Summary by CodeRabbit

New Features

• Added version information retrieval capability to support programmatic access to package version details.

Walkthrough

This pull request introduces a new utility function getVersion in the build package. A new function is added to packages/build/src/utils/json.ts that returns the version field from an already-loaded ROOT_PACKAGE_JSON object. The function is then exported from packages/build/src/index.ts as a named export, making it available to consumers of the package. The changes are minimal and purely additive.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

✨ Finishing Touches

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• Create stacked PR
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🧪 Generate unit tests (beta)

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• Commit unit tests in branch pieh/export-netlify-build-version

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• Generate coding plan for human review comments

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