Mc 1578 add event bridge rule

[mmiermans]

Goal

Prevent outages of Pocket Home that were caused by recommending a removed corpus item. When the GraphQL corpus item resolver cannot find an item, the entire response will fail.

The remediation we settled on is to temporarily insert removed items in a shared cache, based on the EventBridge remove events.

Todos

• [ ] Outstanding todo
• [x] Completed todo

Review

• [ ] Security @ReviewerA
• [ ] Test coverage @ReviewerC
• [ ] ...

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Deployment

• [ ] Secrets?

Reference

Tickets:

• Link to JIRA tickets

Implementation Decisions