fix(storybook): handle main.js file correctly in storybook plugin

[leosvelperez]

Current Behavior

Expected Behavior

Related Issue(s)

Fixes #22042

[vercel]

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1 Ignored Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Feb 29, 2024 5:42pm

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✅ Successfully ran 6 targets

• nx affected --target=e2e --base=7879b3fd2e772facf61fd520de49b5ba2fc7dcd9 --head=2f640b07ce6e1b75eefa43c3b0600ec7bb934559 --parallel=1
• nx affected --targets=lint,test,build --base=7879b3fd2e772facf61fd520de49b5ba2fc7dcd9 --head=2f640b07ce6e1b75eefa43c3b0600ec7bb934559 --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=7879b3fd2e772facf61fd520de49b5ba2fc7dcd9 --head=2f640b07ce6e1b75eefa43c3b0600ec7bb934559
• nx documentation --no-dte
• nx affected -t e2e-macos --parallel=1 --base=7879b3fd2e772facf61fd520de49b5ba2fc7dcd9 --head=2f640b07ce6e1b75eefa43c3b0600ec7bb934559

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[github-actions]

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