ci: moves to pnpm

[gsimone]

• Takes the pnpmfile.cjs thing from #276

• Removes Cypress as we aren't really using

• Moves to pnpm as yarn 3 never felt good

• adds manypkg to lint and fix the package jsons

TODO

• [ ] Weird type error in plugins

closes #276

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Latest commit: 94e8933d941e20e4388cc5512f0411f98d237a6e

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Name	Status	Preview	Updated
leva	✅ Ready (Inspect)	Visit Preview	Apr 26, 2022 at 5:34PM (UTC)

[codesandbox-ci[bot]]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 94e8933d941e20e4388cc5512f0411f98d237a6e:

Sandbox	Source
leva-minimal	Configuration
leva-busy	Configuration
leva-scroll	Configuration
pmndrs/leva	Configuration
leva-ui	Configuration
leva-theme	Configuration
leva-transient	Configuration
leva-plugin-plot	Configuration
leva-plugin-bezier	Configuration
leva-plugin-spring	Configuration
leva-custom-plugin	Configuration

[dbismut]

Closing in favor of #412