CLI: add "storybook scripts 7.0" automigrate command

[yannbf]

Issue: N/A

What I did

In Storybook 7.0, the binaries contained in @storybook/<whatever-framework> were removed and now the start-storybook and build-storybook scripts will come from a storybook standalone lib, with scripts like storybook dev and storybook build.

This PR adds an automigration to detect the scripts from previous versions. It will:

• Detect whether it should happen (Storybook 7.0 and no storybook or sb lib installed) and prompt the user

Upon accepting, it will:

• Install the storybook lib
• Detect "official" and "custom" scripts:

{
  "storybook": "start-storybook", // <-- official
  "build-storybook": "build-storybook", // <-- official
  "docs:start": "start-storybook", // <-- custom
  "docs:build": "build-storybook" // <-- custom
}

• For official scripts, it will turn start-storybook into storybook dev and build-storybook into storybook build
• For custom scripts, it will mention that it couldn't automigrate them. It's tricky to know whether the scripts are actually running the binary or running the npm command with the same name, so we just show them and say "change where applicable". It will display them in the CLI and mention that users should consider migrating the scripts themselves, with a link to the docs:

How to test

• Build the CLI

• Go to a Storybook 6 project and run sb upgrade --prerelease

• Is this testable with Jest or Chromatic screenshots?

• Does this need a new example in the kitchen sink apps?

• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

[nx-cloud]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit 9a45bd4. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this branch

---

✅ Successfully ran 1 target

• nx run-many --target=prepare --all --parallel=8 --max-parallel=15 -- --reset --optimized

---

Sent with 💌 from NxCloud.

[ndelangen]