Introduce internal isWorkerNotFoundError utility and avoid worker-not-found error code magic numbers in wrangler

[dario-piotrowicz]

Just come minor clean-up/refactoring as discussed in #11504 (comment) 🙂

---

• Tests
  • Tests included/updated
  • Tests not necessary because: this is just some code refactoring. the functionality is already tested
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: internal improvement
• Wrangler V3 Backport
  • Wrangler PR: V3 backport: Introduce internal isWorkerNotFoundError utility and avoid worker-not-found error code magic numbers in wrangler #11519
  • Not necessary because:

[changeset-bot]

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Latest commit: 118747d

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[pkg-pr-new]

create-cloudflare

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@cloudflare/vite-plugin

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@cloudflare/vitest-pool-workers

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wrangler

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commit: 118747d