add a util to format compatibility dates

[vicb]

Add a util to format a date as YYYY-MM-DD

It is called multiple times in the current code and +2 times in pending PRs.

---

• Tests
  • Tests included
  • Tests not necessary because: already tested
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: refactoring
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: refactoring

[changeset-bot]

⚠️ No Changeset found

Latest commit: 17e2729

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commit: 17e2729

[danowar2]

Thanks for the update