Chore: Updates to modern npm and more...

[ryan-roemer]

• Switch from yarn to npm
• Remove all benchmarks
• Hone fixture down to just npm simple version

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Latest commit: be1e1e5

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[Copilot]

Pull Request Overview

This PR modernizes the project's tooling and testing infrastructure by switching from Yarn to npm and removing benchmarking functionality. The changes are part of a broader effort to simplify the project's development and CI/CD processes.

• Removes all benchmark-related functionality including the test script, benchmark tests, and CI workflows
• Switches from Yarn to npm for package management throughout the project
• Streamlines the test structure to focus only on the npm "simple" scenario

Reviewed Changes

Copilot reviewed 27 out of 39 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/script.js	Completely removes the comprehensive test script that handled benchmarks and multiple package managers
test/packages/simple/yarn/*	Removes Yarn-specific simple test scenario files
test/packages/complex/yarn/*	Removes Yarn-specific complex test scenario files
test/packages/complex/npm/*	Removes npm-specific complex test scenario files
test/packages/simple/*	Updates plugin path and dependency versions in the remaining simple scenario
test/cli/package.spec.js	Removes complex scenario tests, keeping only simple scenario
test/benchmark.js	Completely removes benchmark validation tests
package.json	Updates scripts to use npm, removes benchmark commands, updates author
README.md	Removes benchmark sections and updates branding
.github/workflows/*	Updates CI to use npm and removes benchmark steps

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