Add gitignore-like helpers to cli package and remove old duplicated logic from c3 and autoconfig

[dario-piotrowicz]

Fixes https://jira.cfdata.org/browse/DEVX-2380

We have some duplicated autoconfig logic that appends wrangler stuff to .gitignore and .assetsignore, this logic is also present in C3. This PR is de-duplicating the logic so that there is only a single function that includes it (maybeAppendWranglerToGitIgnoreLikeFile) and this function is moved to the cli package and used by both C3 and autoconfig.

(Additionally there's also a trivial maybeAppendWranglerToGitIgnore wrapper that also checks that the .git dir exists)

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• 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: refactoring

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Latest commit: e1930dd

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commit: e1930dd

[workers-devprod]

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• ✅ @cloudflare/wrangler

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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