CCM-15801: Reject duplicate trust requests

[lapenna-bjss]

Description

This change separates internal Lambda retries from duplicate messages sent by trusts.

If a trust sends a duplicate, we now emit a MESHInboxMessageInvalid event, which results in a negative acknowledgement back to the trust.

Internal retries are ignored. The message is removed from the inbox and no event is emitted.

Key changes:

• S3 storage now uses a key based on senderId and messageReference. meshMessageId is stored as metadata
• On S3 write conflicts, duplicates are classified as:
  • Internal retry (same meshMessageId)
  • Trust duplicate (different meshMessageId)
• Internal retries are removed from the inbox, tracked via a metric, and do not emit events
• Trust duplicates emit a MESHInboxMessageInvalid event with a DL_CLIV_004 failure code, then are removed from the inbox
• Unit and component tests updated to cover both scenarios
• Added missing DLQ purge in the beforeAll of a few component tests
  • Fixes failures caused by leftover messages in the DLQ

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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