[wrangler] Fix broken runInTempDir import in unstable-get-miniflare-worker-options test

[petebacondarwin]

#13919 added packages/wrangler/src/__tests__/unstable-get-miniflare-worker-options.test.ts with import { runInTempDir } from "./helpers/run-in-tmp". After it was rebased, #13954's helper refactor (12e491e6e) had already deleted that file and moved runInTempDir to @cloudflare/workers-utils/test-helpers, leaving an import on main that points at a non-existent module.

This PR updates the import to use @cloudflare/workers-utils/test-helpers like the rest of the wrangler test suite.

---

• Tests
  • Tests included/updated
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because: this PR is the fix to the broken test import; running the affected test file under vitest verifies it.
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: test-only fix, no user-facing behaviour change.

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