CLI: Run automigrate at the end of sb init

[yannbf]

Issue: #16439

What I did

As title says

How to test

• 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? Maybe?

1 - Generate a sample project without storybook
2 - yarn build cli
3 - <path-to>/storybook/lib/cli/bin/index.js init

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

[nx-cloud]

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Status	Command
	nx run-many --target=prepare --all --parallel --max-parallel=15

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[shilman]

Thank you @yannbf !!! 🙏