CCM-14783: Add SQS DLQ Alarm

[jamesthompson26-nhs]

Description

Adds a new optional alarm for items landing on the DLQ (if created) and one for oldest message in the actual queue.

Both heavily configurable via a object variables.

Opted to default to true to keep in line with the 'Prod-like' defaults pattern. Will need to clear away any BC side alarms that duplicate this function as we implement.

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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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.