Add support for connect handler in miniflare tests

[fhanau]

This is needed to add initial support for the connect handler in workerd (experimental-only for now).

Part of EW-9330. Updates miniflare so that the connect handler is marked as reserved. This is needed for cloudflare/workerd#6059 to land, additional changes are included in #12802 which needs the workerd PR to be merged first. This PR should be sufficient for allowing the workerd PR to land: Reordering the steps in workerd CI shows that while miniflare tests are failing, vite and vitest tests are not so this one change should be sufficient to allow merging the workerd PR.

---

• Tests
  • Tests included/updated: Intended to be tested with EW-9330 Implement connect() handler workerd#6059
  • Automated tests not possible - manual testing has been completed as follows:
  • Additional testing not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: Feature is behind experimental compat flag for now.

---

[changeset-bot]

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Latest commit: 270bd12

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commit: a54f0a6

[workers-devprod]

Codeowners approval required for this PR:

• @cloudflare/wrangler

Show detailed file reviewers

• packages/miniflare/src/shared/external-service.ts: [@cloudflare/wrangler]

[devin-ai-integration]

✅ Devin Review: No Issues Found

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

View in Devin Review to see 2 additional findings.