fix(storybook): do not infer a test-storybook task if @storybook/test-runner is not installed

[leosvelperez]

Current Behavior

@nx/storybook/plugin always infers a test-storybook task with the @storybook/test-runner included in the externalDependencies. It doesn't check whether the package is actually installed, which causes the hasher to fail with The externalDependency '@storybook/test-runner' for '<project>:test-storybook' could not be found.

Expected Behavior

@nx/storybook/plugin should only infer a test-storybook task when the @storybook/test-runner package is installed.

Related Issue(s)

Fixes #

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Apr 26, 2024 0:38am

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✅ Successfully ran 6 targets

• nx affected --targets=e2e,e2e-ci --base=a78e75ccab04f0a37bc5ca5c2d3011842452d2e6 --head=e4dd263c1ae6273aa6e6d9f5fef2905382bbd248 --parallel=1
• nx affected --targets=lint,test,build --base=a78e75ccab04f0a37bc5ca5c2d3011842452d2e6 --head=e4dd263c1ae6273aa6e6d9f5fef2905382bbd248 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=a78e75ccab04f0a37bc5ca5c2d3011842452d2e6 --head=e4dd263c1ae6273aa6e6d9f5fef2905382bbd248
• nx documentation --no-dte
• nx affected -t e2e-macos-ci --parallel=1 --base=a78e75ccab04f0a37bc5ca5c2d3011842452d2e6 --head=e4dd263c1ae6273aa6e6d9f5fef2905382bbd248

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