fix(storybook): check storybook is installed and not on v7 already

[mandarini]

Check that Storybook is installed and that it's not already on v7 before attempting to run migration.

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)			Apr 19, 2023 0:01am

[nx-cloud]

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✅ Successfully ran 8 targets

• nx affected -t e2e-macos --parallel=1 --exclude=e2e-detox
• nx affected --target=e2e --base=4446bf749a050c60ccb2128df7e8a947db4b7b58 --head=35aa8ec105da3659c287028a57617948e05a040b --parallel=1
• nx run-many -t check-imports check-commit check-lock-files depcheck --parallel=1 --no-dte
• nx affected --target=build --base=4446bf749a050c60ccb2128df7e8a947db4b7b58 --head=35aa8ec105da3659c287028a57617948e05a040b --parallel=3
• nx affected --target=test --base=4446bf749a050c60ccb2128df7e8a947db4b7b58 --head=35aa8ec105da3659c287028a57617948e05a040b --parallel=1
• nx affected --target=lint --base=4446bf749a050c60ccb2128df7e8a947db4b7b58 --head=35aa8ec105da3659c287028a57617948e05a040b --parallel=3
• nx-cloud record -- nx format:check --base=4446bf749a050c60ccb2128df7e8a947db4b7b58 --head=35aa8ec105da3659c287028a57617948e05a040b
• nx documentation --no-dte

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[github-actions]

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