Fix: Correctly escape newlines in `constructType` function

[harugon]

What this PR solves / how to test

Fixes #5699

This PR fixes the issue with constructType function handling multiline strings improperly. It ensures that newlines in strings are correctly escaped, preventing invalid JavaScript code generation.

Author has addressed the following

• Tests
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• E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • [ ] I don't know
  • [ ] Required / Maybe required
  • [x] Not required because: This change affects type generation only
• Changeset (Changeset guidelines)
  • [x] Included
  • [ ] Not necessary because:
• Public documentation
  • [ ] TODO (before merge)
  • [ ] Cloudflare docs PR(s):
  • [x] Not necessary because: Internal functionality change only

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 8836004c306c9c694f4ad1c64ee513ba08d3ec53

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

This PR includes changesets to release 2 packages

Name	Type
wrangler	Patch
@cloudflare/vitest-pool-workers	Patch

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---

[email protected] includes the following runtime dependencies:

Package	Constraint	Resolved
miniflare	workspace:*	3.20240701.0
workerd	1.20240701.0	1.20240701.0
workerd --version	1.20240701.0	2024-07-01

Please ensure constraints are pinned, and miniflare/workerd minor versions match.

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[petebacondarwin]

After running the tests, I noticed that the original backslash escaping tests were not correct either. So this fix actually fixes that too.

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