chore: cleanup root dependencies

[merceyz]

What's the problem this PR addresses?

The root package.json lists dependencies we don't really need to / we can clean up.

How did you fix it?

• Removed the jest-junit reporter since we're not using the reports it generates.
• Removed jest-environment-node since Jest depends on this internally, we just need to tell it to use it.
• Removed the Babel plugins and let @babel/preset-env deal with it.
• Removed babel-jest, github-api, micromatch, and @types/emscripten since they aren't used in the root workspace.

Checklist

• I have read the Contributing Guide.
• I have set the packages that need to be released for my changes to be effective.
• I will check that all automated PR checks pass before the PR gets reviewed.