Add SQS Dead Letter Queue for Lambda function

[Copilot]

Implements the TODO to add SQS DLQ for the Lambda function, resolving Checkov rule CKV_AWS_116.

Changes

• SQS Queue: Created aws_sqs_queue.lambda_dlq with 14-day message retention
• IAM Policy: Added lambda_dlq_policy granting sqs:SendMessage permission to the Lambda execution role
• Lambda Configuration: Added dead_letter_config block to route failed invocations after retry exhaustion
• Outputs: Exposed lambda_dlq_url and lambda_dlq_arn for monitoring

resource "aws_lambda_function" "info" {
  # ...
  dead_letter_config {
    target_arn = aws_sqs_queue.lambda_dlq.arn
  }
}

Removes #checkov:skip:CKV_AWS_116 as the requirement is now satisfied.

Original prompt

Work on TODO: add SQS for DLQ (from main.tf)

Created from VS Code via the GitHub Pull Request extension.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.68%. Comparing base (730d65a) to head (40e07cd).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #864   +/-   ##
=======================================
  Coverage   46.68%   46.68%           
=======================================
  Files          51       51           
  Lines        3046     3046           
=======================================
  Hits         1422     1422           
  Misses       1561     1561           
  Partials       63       63           

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