Advanced filtering & dead-lettering

In this exercise, you'll create an Event Grid Topic and an Event Subscription that delivers only events whose subject ends with ".jpg", and you'll configure a dead-letter destination in Azure Storage for undeliverable events. You'll publish sample events to verify that matching ".jpg" events are delivered while non-matching events are dropped (and therefore do not appear in dead-letter), and that the dead-letter location is ready for any future delivery failures.