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Add Javascript NPM Non-Lock File Parser

Emerald-Jayde Henao requested to merge js-npm-file-parser into master

What does this MR do and why?

Background

The Repository X-Ray is a tool that searches for dependency manager configuration files and then extracts a list of libraries from the content.

In #474306 (comment 2025085630), we decided to migrate the Repository X-Ray functionality into the GitLab Rails monolith. This gives us two main benefits: (i) it will eventually allow us to run the service outside of the CI pipeline, and (ii) we can maintain the parsing logic centrally so that other domains can utilize it.

Base MR

In !162313 (merged), we introduced the LockFiles::Base class where the intention is for each lock file type to be represented by a child class. The child class is to contain the parsing logic to extract a list of libraries and their versions from the file content.

This MR

In this MR, we introduce the JavascriptNpm lock file class that parses package.json.

Resolves part of #476177 (closed).

MR acceptance checklist

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Related to #476177 (closed)

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