Validate environments for unexpected fields, not just top level env

[emily-shen]

Fixes #11956

Previously we warned on this only:

{
  "main": "src/index.ts",
  "name": "worker",
   "unexpected": "field"
}

Now we also warn on this:

{
  "main": "src/index.ts",
  "name": "worker",
  "env": {
    "prod": {
      "unexpected": "field"
    }
  },
}

---

• 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: bugfix

A picture of a cute animal (not mandatory, but encouraged)

[changeset-bot]

🦋 Changeset detected

Latest commit: b625384

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

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commit: b625384

[dario-piotrowicz]

LGTM 🙂