Add Zone to CRE User Workflow Metrics Payload

[cawthorne]

Adds Zone to CRE User Workflow Metrics Payload, so we don't have to maintain an external mapping of (don_id, env) => zone

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Latest commit: 7d26523

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	⏩ skipped	Jun 1, 2026, 5:45 PM