[Refactor] Use uniq helper in Cloudflare tunnel

[gonzaloriestra]

WHY are these changes introduced?

Internal refactoring to use consistent utility helpers for array deduplication.

WHAT is this pull request doing?

Replaces manual Set spreads with the uniq helper from @shopify/cli-kit/common/array in packages/plugin-cloudflare/src/tunnel.ts.

How to test your changes?

CI

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

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PR created automatically by Jules for task 13075179151143793518 started by @gonzaloriestra

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