wrangler: feat: validate Worker subdomain mixed state

[danielrs]

Tracking internally: https://jira.cfdata.org/browse/WC-3931

Describe your change...

Enabling or disabling workers_dev is often an indication that the user is also trying to enable or disable preview_urls. Warn the user when these enter mixed state.

---

• Tests
  • Tests included
  • Tests not necessary because:
• Public documentation
  • Cloudflare docs PR(s):
  • Documentation not necessary because: just adding warns around existing features.
• Wrangler V3 Backport
  • Wrangler PR:
  • Not necessary because: not a patch change.

[changeset-bot]

🦋 Changeset detected

Latest commit: 9894b79

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

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commit: 9894b79

[petebacondarwin]

Looks good to me - just the thing about using our standard env-var tools