repo maintenance (if anyone wants to help)

[NullVoxPopuli]

These tasks will help maintainability long term:

• [ ] move off yarn@1 to something better (there is a pr for yarn@4, it needs reviewed)

Probably in order:

• [x] ditch jest (it's legacy / sunset (unofficially) in favor of vitest
• [ ] convert tests to their own workspaces
• [ ] convert test workspaces to esm, so they can use newer versions of dependencies which may no longer support cjs (glimmer, for example)

Some unknown unknowns, and may need discussion:

• [ ] build inline the environments, we don't need glint's architecture to be so flexible, and we can reduce some complexity (aka have the Polaris experience be default and not require configuration)

[dfreeman]

I don't think we're using jest anywhere 🤔

[NullVoxPopuli]

Excellent! easy checkbox!