[App Configuration] Prepare Release Script (Azure#27326)

Author: minhanh-phan

sdk/appconfiguration/app-configuration/CHANGELOG.md

@@ -1,14 +1,11 @@
 # Release History
-## 1.5.0-beta.2 (Unreleased)
 
-### Breaking Changes
+## 1.5.0-beta.2 (2023-10-10)
 
 ### Features Added
 
 - Allow setting `updateIntervalInMs` in `CreateSnapshotOptions`
 
-### Bugs Fixed
-
 ### Other Changes
 
 - Rename `Snapshot` -> `ConfigurationSnapshot`