feat: add type declaration files if they do not exist in Astro templates

[mohankumarelec]

Fixes #7416
Fixes #6930

Describe your change...

Add type declaration files if they do not exist in Astro templates

---

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  • Cloudflare docs PR(s):
  • Documentation not necessary because: bug fix

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Latest commit: 099782c

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[dario-piotrowicz]

Thank you very much for the PR @mohankumarelec 🙏

I'm very sorry, I didn't see you opening this PR and I've already implemented a solution for this issue in #7497 😓 🙇

Your PR seems to also update the file incorrectly (I don't think it shouldn't just refer to ../.astro/types.d.ts, right @alexanderniebuhr?) and it is not using C3's utilities (but calling existsSync and writeFileSync directly, which is inconsistent with the C3 code)

So I am closing this PR in favour of #7497, sorry 🙇