feat: add integration test and implementation for trade webhook event…

[Benedict315]

… types

Summary

Testing

• pnpm lint
• pnpm build
• pnpm exec prisma generate when schema or generated types changed

Checklist

• Linked issue or backlog item
• No secrets or live credentials added
• Docs updated if setup or env changed
• Change is scoped to one problem
  Closes Add integration test for webhook delivery payload containing correct event type field #514

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