Prepare azidentity v1.5.0-beta.2 for release (Azure#21884)

Author: chlowell

sdk/azidentity/CHANGELOG.md

@@ -1,17 +1,11 @@
 # Release History
 
-## 1.5.0-beta.2 (Unreleased)
+## 1.5.0-beta.2 (2023-11-07)
 
 ### Features Added
 * `DefaultAzureCredential` and `ManagedIdentityCredential` support Azure ML managed identity
 * Added spans for distributed tracing.
 
-### Breaking Changes
-
-### Bugs Fixed
-
-### Other Changes
-
 ## 1.5.0-beta.1 (2023-10-10)
 
 ### Features Added