backport: fix missing stylesheets when parallel routes are present

[ztanner]

Backports:

• move layerAssets into CacheNodeSeedData #67436

With test case from:

• fix missing stylesheets when parallel routes are present #66300

[github-actions]

Hi there 👋

It looks like this PR introduces broken links to the docs, please take a moment to fix them before merging:

Broken link	Type	File
/docs/app/building-your-application/optimizing/package-bundling#analyzing-javascript-bundles	link	/docs/02-app/01-building-your-application/06-optimizing/13-memory-usage.mdx

Thank you 🙏

[ijjk]

Failing test suites

Commit: 3770246

TURBOPACK=1 pnpm test-start test/e2e/app-dir/parallel-routes-css/parallel-routes-css.test.ts (turbopack)

• parallel-routes-catchall-css > should properly load the Head content from multiple leaf segments

Expand output

● parallel-routes-catchall-css › should properly load the Head content from multiple leaf segments

expect(received).toBe(expected) // Object.is equality

Expected: "rgb(255, 0, 0)"
Received: "rgba(0, 0, 0, 0)"

  33 |
  34 |     // the slot's background color should be red
> 35 |     expect(await getSlotBackgroundColor(browser)).toBe('rgb(255, 0, 0)')
     |                                                   ^
  36 |
  37 |     // there should no longer be a main element
  38 |     expect(await browser.hasElementByCssSelector('#main')).toBeFalsy()

  at Object.toBe (e2e/app-dir/parallel-routes-css/parallel-routes-css.test.ts:35:51)

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