[azsystemevents] Regenerate based on latest update (adding in storage tiers to some system events) (#23269)

Some other changes have come along for the ride or been implemented:

- Removal of types that were only used as base properties for events, but were not system events on their own. These were things like `ACSChatThreadEventInThreadBaseProperties`. Our generator handles this by just inlining those properties into the child "classes", so the base struct is just vestigial (except in a few cases where the base type is actually a system event).
- Updated to proper hash from main.

Author: richardpark-msft

sdk/messaging/eventgrid/azsystemevents/CHANGELOG.md

@@ -1,14 +1,16 @@
 # Release History
 
-## 0.4.1 (Unreleased)
+## 0.4.1 (2024-08-20)
 
 ### Features Added
 
-### Breaking Changes
+- New fields have been added:
+  - StorageBlobCreatedEventData: AccessTier
+  - StorageBlobTierChangedEventData: AccessTier and PreviousTier
 
-### Bugs Fixed
+### Breaking Changes
 
-### Other Changes
+- Models that were not system events (ex: ACSChatMessageEventInThreadBaseProperties), or referenced by system events, have been removed. 
 
 ## 0.4.0 (2024-06-11)
 

sdk/messaging/eventgrid/azsystemevents/constants.go

@@ -137,11 +137,28 @@ func deleteUnneededFiles() {
 
 func doRemove() error {
 	modelsToRemove := []string{
-		// these are not events, themselves, but are just contained within
-		// other events.
+		// These types are base objects of some of our system events in the TypeSpec, giving them a simple way to share fields.
+		// Our generator handles this parent/child relationship by just inlining those properties into the children, so the base struct is just vestigial.
+		// Note that these have been annotated with @output, which is why they're not just clipped out using our normal "unused/unreferenced" type logic
+		// in the Go emitter.
+		"ACSChatEventBaseProperties",
+		"ACSChatEventInThreadBaseProperties",
+		"ACSChatMessageEventBaseProperties",
+		"ACSChatMessageEventInThreadBaseProperties",
+		"ACSChatThreadEventBaseProperties",
+		"ACSChatThreadEventInThreadBaseProperties",
+		"ACSRouterEventData",
+		"ACSRouterJobEventData",
+		"ACSRouterWorkerEventData",
+		"ACSSmsEventBaseProperties",
+		"AppConfigurationSnapshotEventData",
 		"AVSClusterEventData",
 		"AVSPrivateCloudEventData",
 		"AVSScriptExecutionEventData",
+		"ContainerServiceClusterSupportEventData",
+		"ContainerServiceNodePoolRollingEventData",
+		"ResourceNotificationsResourceDeletedEventData",
+		"ResourceNotificationsResourceUpdatedEventData",
 	}
 
 	for _, m := range modelsToRemove {