Update changelog and version.py after release cut (Azure#40752)

* Update  new version of azure-ai-ml

* add next version in CHANGELOG.md

* Update CHANGELOG.md

* Update SDK release date

Author: pdhotems

sdk/ml/azure-ai-ml/CHANGELOG.md

@@ -1,6 +1,11 @@
 # Release History
+## 1.28.0 (unreleased)
 
-## 1.27.0 (unreleased)
+### Features Added
+
+### Bugs Fixed
+
+## 1.27.0 (2025-05-07)
 
 ### Features Added
 - Added Target storage connection for capability host.

sdk/ml/azure-ai-ml/azure/ai/ml/_version.py

@@ -2,4 +2,4 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # ---------------------------------------------------------
 
-VERSION = "1.27.0"
+VERSION = "1.28.0"