feat(core): export detectProjects utility function

[fahslaj]

Description

Exports the detectProjects() function used by Lerna.

Motivation and Context

This allows external tooling to operate on the same project graph that Lerna does:

const { detectProjects } = require("lerna/utils");
const { projectGraph, projectFileMap } = await detectProjects();

#3721

How Has This Been Tested?

This has been tested manually.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Chore (change that has absolutely no effect on users)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

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• nx run-many -t test --parallel=3 --ci --maxWorkers=2 --testTimeout=60000 --testPathIgnorePatterns=save.spec.ts --testPathIgnorePatterns=find-file.spec.ts --testPathIgnorePatterns=chain-class.spec.ts
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