Implement direct tickets

[iliapolo]

Based on https://github.com/cdklabs/cdk-atmosphere-service/blob/main/docs/design.md#direct-tickets

[iliapolo]

On second thought, implementing direct tickets is somewhat awkward because it either requires using an internal API (which we can't do in a public repo), or creating ephemeral alarms with a SIM action, which has proved to be rather confusing.

Instead, we are going to keep track of the number of dirty environments and create a regular alarm if the count is greater than 0. To resolve the alarm, we will provide a report of the specific environments that needs manual cleaning.