CLI: Fix CRA version detection crash

[shilman]

Issue: #16306

What I did

When the user specifies --type react_scripts or runs sb init in a monorepo where we cannot find the react-scripts package version, sb init crashes.

This workaround assumes that we are on CRA4 for now, since that is the latest stable version. It will need to be updated at some point after CRA5 is released.

In addition to this change, I have taken the further action of updating the dist tags for @storybook/preset-create-react-app:

• latest = 3.2.0
• next = 4.0.0

This will also need to be updated as soon as CRA5 is released. @tmeasday should I just go ahead and point the CLI to next if the app is CRA5?

How to test

mkdir foo && cd foo
npm init
/path/to/storybook/lib/cli/bin/index.js init --type react_scripts

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[tmeasday]

@tmeasday should I just go ahead and point the CLI to next if the app is CRA5?

Maybe it would make sense to have dedicated dist tags for the versions of CRA? IDK

[tmeasday]

LGTM