Remove npm package monorepo-symlink-test (contains malicious code)

[muhanator]

npm package monorepo-symlink-test is used in

resolve/test/resolver/multirepo/package.json

Lines 2 to 4 in 093a9d8

	"name": "monorepo-symlink-test",
	"private": true,
	"version": "0.0.0",

should be removed as it was found to contain malicious code and was removed from the registry by the npm security team. Anybody using npm package resolve:1.22.1 (latest version of resolve) has this in their code and can be at risk.
see https://www.npmjs.com/package/monorepo-symlink-test

[ljharb]

This package.json has private: true, because it has nothing to do with the malicious package in question. If your security analysis tool is reporting it, it's broken, and you should file a bug on it. There is zero risk here.

See #290.