Non-existing template options now filtered out for lang in C3

[dom96]

When running create-cloudflare with the --lang=python argument, all templates are shown including ones that don't support Python. This PR filters those out.

---

• Tests
  • Tests included
  • Tests not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: feature improvement
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: c3 change

---

$ pnpm i
$ pnpm run test:e2e:c3

[changeset-bot]

🦋 Changeset detected

Latest commit: a720058

The changes in this PR will be included in the next version bump.

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commit: a720058