build: yarn berry migration

[mcataford]

Description

Moves from Yarn Classic to Yarn Berry (sans zero-installs). Other than being newer, YBerry has some great built-in tooling and features that are going to be good moving forward.

The next step on this is to turn on pnp as the node linking strategy. This is currently raising some errors around the Jest setup, so I'll leave it as a followup. In the meantime, Yarn Berry is already better than Classic, even if we're still stuck with node_modules.

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] I have used ESLint & Prettier to follow the code style of this project.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[github-actions[bot]]

:tada: This PR is included in version 8.1.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: