Extend cron to catch about to expire legal tags

Changes related to ADR

• Existing cron job for checking expired legal tags is extended to check about to expire legal tags regarding declared period to expire.
• Existing legal SNS topic with new item is used.
• Changes are hidden behind the feature flag

New SNS topic item:

    {
        "aboutToExpireLegalTags": [ 
            {
                "dataPartitionId":"osdu",
                "tagName":"osdu-public-usa-dataset-osduonaws-test-about-to-expire",
                "expirationDate":"Mar 15, 2024"
            }
        ]
    }

Info in logs about catching about to expire legal tag: