[EventGrid-CNCF] Release CNCF bridge cloud event first beta. v1.0.0-beta.1 (Azure#26520)

Author: mssfang

sdk/eventgrid/azure-messaging-eventgrid-cloudnative-cloudevents/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## 1.0.0-beta.1 (Unreleased)
+## 1.0.0-beta.1 (2022-01-18)
 
 ### Features Added
 - Added the bridge library to allow sending Cloud Native Computing Foundation(CNCF) CloudEvents using Azure Event Grid.