[C3/wrangler] Fix Angular localhost SSR blocking in development mode

[petebacondarwin]

Fixes the Angular C3 e2e tests that were quarantined due to URL with hostname "localhost" is not allowed. errors.

Recent versions of Angular's AngularAppEngine block serving SSR on localhost by default. See angular/angular-cli#32516.

This PR fixes it by passing allowedHosts: ["localhost"] to the AngularAppEngine constructor in server.ts:

const angularApp = new AngularAppEngine({
    allowedHosts:['localhost'],
});

This approach is better than modifying angular.json because:

• No assumptions about the user's angular.json structure (important for autoconfig)
• No need to force --configuration development in build scripts
• Works across all three integration paths (C3 pages, C3 workers, wrangler autoconfig)

It is safe to hard code this allowed host because in Cloudflare production deployments it is never possible for localhost to hit the deployed server code.

Also unquarantines all three Angular C3 e2e tests.

---

• 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):
  • Documentation not necessary because: No user-facing docs changes needed; this fixes internal scaffolding behavior

---

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Latest commit: 56920b5

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commit: 56920b5

[dario-piotrowicz]

Very nice! 😃

[vicb]

LGTM

Could you please sync the PR description with the latest version of the code?