Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-cleanrooms-91130.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``cleanrooms``",
+  "description": "Added support for publishing detailed metrics to CloudWatch for operational monitoring of collaborations, including query performance and resource utilization."
+}

.changes/next-release/api-change-identitystore-96094.json

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+{
+  "type": "api-change",
+  "category": "``identitystore``",
+  "description": "This change introduces \"Roles\" attribute for User entities supported by AWS Identity Store SDK."
+}