ISS-6802 Fix issue with init in create-react-library projects

[MikaelCarpenter]

Issue: #6802

There's two causes to this issue:

• create-react-library puts react-scripts in devDeps
• semver.gtr() fails if you pass it undefined

What I did

• In the REACT_SCRIPTS generator, check both dependencies and devDependencies for react-scripts
• Also, make sure it exists before trying to use semver

How to test

1. npm install -g create-react-library
2. create-react-library -s -t default test
3. cd test
4. npx -p @storybook/cli@next sb init

I tested init before and after the changes and looked good to me 👍

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[shilman]

Makes sense!