fix(prune): fix Yarn1 entries getting merged erroneously

[chris-olszewski]

Description

Fixes #8849

This is a port of yarnpkg/yarn#9023 our codebase.

Previously, Yarn would collapse all identical entries to share a slot in the lockfile with the keys joined by , e.g. next@latest, [email protected]. We copied that logic which resulted in string-width-cjs@npm:[email protected] and [email protected] getting collapsed as they have identical data:

 version "4.2.0"
  resolved "https://registry.yarnpkg.com/string-width/-/string-width-4.2.0.tgz#952182c46cc7b2c313d1596e623992bd163b72b5"
  integrity sha512-zUz5JD+tgqtuDjMhwIg5uFVV3dtqZ9yQJlZVfq4I01/K5Paj5UHj7VyrQOJvzawSVlKpObApbfD0Ed6yJc+1eg==
  dependencies:
    emoji-regex "^8.0.0"
    is-fullwidth-code-point "^3.0.0"
    strip-ansi "^6.0.0"

This behavior was altered in the PR linked above where now it will no longer group keys for identical entries if they have different package names in the keys. So since string-width-cjs != string-width these will have separate slots.

This PR intentionally isn't super Rust-y so we're able to better update our behavior to match Yarn in case we need to update.

Testing Instructions

Added a unit test from reproduction to ensure that we no longer merge the problematic entries.

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