Update `PageLayout` condensed spacing to be 8px

[langermank]

This seems like a bug that condensed and normal spacing values were almost identical. This PR updates the PageLayout component to use 8px for the condensed spacing instead of 16px, ensuring a clearer distinction between the two spacing options

Rollout strategy

I will be manually updating any instance of condensed to normal in dotcom

• [ ] Patch release
• [x] Minor release
• [ ] Major release; if selected, include a written rollout or migration plan
• [ ] None; if selected, include a brief description as to why

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)

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 1ea1c84172e6e8e6fa07ea2278584944f7905a8d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@primer/react	Minor

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[github-actions[bot]]

size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	97.59 KB (-0.1% 🔽)
packages/react/dist/browser.umd.js	97.84 KB (+0.04% 🔺)

[primer-integration[bot]]

:wave: Hi from github/github! Your integration PR is ready: https://github.com/github/github/pull/344435

[github-actions[bot]]

:wave: 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!

[langermank]

Closing as this is just too big of a visual change. Will re-evaluate in the future.