fix(cli): set specific version of pnpm for monorepos

[hoersamu]

What?

• Set specific version for pnpm in packageManager field in the package.json file when creating monorepos
• Exclude yarn specific files from monorepos that do not use yarn

Why?

fixes #329

• pnpm monorepo creation failed when pnpm is installed using Corepack. This issue was caused by the missing version of the packageManager in the package.json file
• Even if the monorepo was created with a package manager other than yarn the yarn specific config files were copied to the target folder.

How to test? (optional)

I validated the corepack fix on my machine and tested monorepo creation with all package managers.
I expanded the test for monorepo creation to validate the yarn config file changes.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
plugin-sandbox	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 11, 2024 9:25am

[eunjae-lee]

Thanks for your contribution! And also thanks for adding the test cases :D

I've left a feedback, but it's not a blocker.

[eunjae-lee]

@all-contributors please add @hoersamu for bug and code.

[allcontributors]

@eunjae-lee

I've put up a pull request to add @hoersamu! 🎉

[eunjae-lee]

Thanks. This looks great ! :)