adding change logs for email plugin

Plugins/app_service_email/CHANGE_LOG

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+
+# Change Log
+  
+## [1.2.0] - 2024-07-01
+  
+### Added
+- Support for Managed Identity integration. 
+
+## [1.1.0] - 2024-06-19
+ 
+### Added
+- Added support for Email headers.
+- Added HTML rendering for email content.
+- Added email logs dashboard.
+
+### Fixed
+- Removed trailing slash from ACS endpoint URL.