feat: Update Angular template to version 19

[alan-agius4]

This prerelease version 19 includes several developer experience (DX) improvements:

• Introduces a new server routing API
• Portable with no Node.js dependencies
• Supports a "neutral" output format

Fixes #0000

Author has addressed the following

• Tests
  • [ ] TODO (before merge)
  • [ ] Included
  • [x] Not necessary because: covered by C3 e2e tests
• Changeset (Changeset guidelines)
  • [ ] TODO (before merge)
  • [x] Included
  • [ ] Not necessary because:
• Public documentation
  • [ ] TODO (before merge)
  • [ ] Cloudflare docs PR(s): https://github.com/cloudflare/cloudflare-docs/pull/...
  • [x] Not necessary because: no change to developer docs for Angular