CC-5521: Revert to "dev" when instance type is absent

[nikitassharma]

When the instance_type field is absent in the wrangler config and no other vcpu, memory, or disk configuration is set, automatically populate the instance_type field with "dev".
This way, deleting instance_type from wrangler.jsonc reverts the deployment back to dev.

Fixes CC-5521

---

• Tests
  • TODO (before merge)
  • Tests included
  • Tests not necessary because:
• Wrangler / Vite E2E Tests CI Job required? (Use "e2e" label or ask maintainer to run separately)
  • I don't know
  • Required
  • Not required because:
• Public documentation
  • TODO (before merge)
  • Cloudflare docs PR(s):
  • Documentation not necessary because: "dev" as default instance type is already documented
• Wrangler V3 Backport
  • TODO (before merge)
  • Wrangler PR:
  • Not necessary because: We don't need to backport Cloudchamber changes to v3, since it's still private beta

[changeset-bot]

🦋 Changeset detected

Latest commit: 0dabe35

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

This PR includes changesets to release 2 packages

Name	Type
wrangler	Patch
@cloudflare/vitest-pool-workers	Patch

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commit: 32f7b98

[CarmenPopoviciu]

LGTM! Can we please get approval from the cloudchamber folks as well 🙏 ?

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[CarmenPopoviciu]

e2es ran via #9721