feat: copy LICENSE file from monorepo root on pack

[tien]

What's the problem this PR addresses?

#6359

How did you fix it?

Add workspace root LICENSE via genPackList & genPackStream.

Checklist

• [x] I have read the Contributing Guide.

• [x] 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.

[tien]

Hey @merceyz @arcanis, sorry for the ping. I believe this feature requires a breaking change. It's not super crucial, just a feature of pnpm that would be nice to have in Yarn. So I'm happy to keep this PR open and wait for the next available major release slot if you guys think that's the best way to go 🙏.

[tien]

Friendly 🏓 @merceyz, @arcanis

[tien]

@arcanis any updates regarding the feedbacks? 🙏

[tien]

@arcanis friendly 🏓

[tien]

Hey @arcanis sorry for bothering you, but would be really great if I could get more guidance on this, thank you!