Benchmarks work v2

[darcyclarke]

• Remove/delete fork of pnpm benchmarks project
• Update pull-request comment with threshold (use algorithm)
• Make benchmark repo public (fixes auth issue https://github.com/npm/cli/blob/latest/.github/workflows/benchmark.yml#L38)

[mikemimik]

Archived Old Repository:
https://github.com/npm/package-manager-benchmarks

[mikemimik]

Second task completed by this pull-request npm/benchmarks#4

[mikemimik]

Third task is contentious based on this npm/benchmarks#3 (comment)