CCM-13638: configurable dlq retention period

[harrim91]

Description

Adds variable to configure DLQ message retention period separately to the main queue. The default for this variable is 14 days.

Set two templates queues to use the updated module code from my local filesytem. One has an explicit dlq retention period of 600 seconds (10 minutes). The other does not explicitly set the variable so will use the default.

Deployed my sandbox environment from my laptop. The DLQ's are correctly configured:

Context

We had some DLQ items in templates prod which got deleted when the 1 day retention period expired.
The default retention period is 1 day, and the DLQ retention period wasn't directly configurable.
The default retention period for DLQ's in core is 14 days, so this matches that.

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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