changelog for 1.5.0-beta.1 release (Azure#53300)

Author: harsimar

sdk/monitor/Azure.Monitor.OpenTelemetry.Exporter/CHANGELOG.md

@@ -1,6 +1,6 @@
 # Release History
 
-## 1.5.0-beta.1 (Unreleased)
+## 1.5.0-beta.1 (2025-10-16)
 
 ### Features Added
 
@@ -20,12 +20,6 @@
 * Added handling of stable database client span semantic conventions
   ([#53050](https://github.com/Azure/azure-sdk-for-net/pull/53050))
 
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes
-
 ## 1.4.0 (2025-05-08)
 
 ### Other Changes