Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-ce-58121.json

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+{
+  "type": "api-change",
+  "category": "``ce``",
+  "description": "This release supports percentage-based thresholds on Cost Anomaly Detection alert subscriptions."
+}

.changes/next-release/api-change-cloudwatch-17686.json

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+{
+  "type": "api-change",
+  "category": "``cloudwatch``",
+  "description": "Update cloudwatch command to latest version"
+}

.changes/next-release/api-change-networkmanager-42772.json

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+{
+  "type": "api-change",
+  "category": "``networkmanager``",
+  "description": "Appliance Mode support for AWS Cloud WAN."
+}

.changes/next-release/api-change-redshiftdata-37653.json

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+{
+  "type": "api-change",
+  "category": "``redshift-data``",
+  "description": "This release adds a new --client-token field to ExecuteStatement and BatchExecuteStatement operations. Customers can now run queries with the additional client token parameter to ensures idempotency."
+}

.changes/next-release/api-change-sagemakermetrics-94856.json

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+{
+  "type": "api-change",
+  "category": "``sagemaker-metrics``",
+  "description": "Update SageMaker Metrics documentation."
+}