Bug fix: className passed to PageLayout twice

[langermank]

Closes https://github.com/github/primer/issues/4911

Removed the className call from the content wrapper

Rollout strategy

• Patch release
• Minor release
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Testing & Reviewing

Merge checklist

• Added/updated tests
• Added/updated documentation
• Added/updated previews (Storybook)
• Changes are SSR compatible
• Tested in Chrome
• Tested in Firefox
• Tested in Safari
• Tested in Edge
• (GitHub staff only) Integration tests pass at github/github (Learn more about how to run integration tests)

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Latest commit: 0427ef8

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github depends on. If you are GitHub staff, we recommend testing these changes with github/github using the integration workflow. Thanks!

[github-actions]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	105.48 KB (+0.04% 🔺)
packages/react/dist/browser.umd.js	105.85 KB (+0.05% 🔺)