WC-5584 [wrangler] previews: fix wrangler-action missing worker_name

[podonnell-dev]

Fixes WC-5584.

Introducing previews support in wrangler-action revealed that we do not return worker_name reliably. This is an API schema gap since EWC explicitly does not return worker_name.

Addressing this in wrangler seems like the right move - we can simply compute this with existing functions

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s): Worker Previews docs: restructure resources, update cross-references cloudflare-docs#31775
  • Documentation not necessary because:

A picture of a cute animal (not mandatory, but encouraged)

[changeset-bot]

🦋 Changeset detected

Latest commit: 24659c5

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

This PR includes changesets to release 3 packages

Name	Type
wrangler	Patch
@cloudflare/vite-plugin	Patch
@cloudflare/vitest-plugin	Patch

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[ask-bonk]

LGTM

github run

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commit: 24659c5

[workers-devprod]

Codeowners approval required for this PR:

• @cloudflare/wrangler

Show detailed file reviewers

• .changeset/warm-cats-preview.md: [@cloudflare/wrangler]
• packages/deploy-helpers/src/preview/api.ts: [@cloudflare/wrangler]
• packages/wrangler/src/tests/preview.test.ts: [@cloudflare/wrangler]
• packages/wrangler/src/preview/preview.ts: [@cloudflare/wrangler]

[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.