fix(cli): better support for yarn 2+

[frankcalise]

Please verify the following:

• [ ] yarn test jest tests pass with new tests, if relevant
• [ ] yarn lint eslint checks pass with new code, if relevant
• [ ] yarn format:check prettier checks pass with new code, if relevant
• [ ] README.md (or relevant documentation) has been updated with your changes

Describe your PR

• Closes #2670

[morganick]

@frankcalise changes look fine. Do you have an easy way to test this? The only way I could think of doing it is to create a monorepo structure so that I could preset yarn v4 and then ignite the app inside of it.

[morganick]

Been using corepack for yarn which is on a per project basis. 🤔 Guess I could install yarn 4 globally. Monorepo yarn install works. (There are other ignite complications, but yarn install completes successfully.)

I'll give that a go when I circle back around to this.