Support Cases don't get marked as closed

[jchrisfarris]

The default call for support cases is
response = client.describe_cases(includeResolvedCases=get_all)
where get_all is False.

Better to try and use the boto3 params afterTime & beforeTime
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/support.html#Support.Client.describe_cases

This will avoid writing out new objects to S3 every pass if the ticket hasn't been updated.