Update changelog based on model updates

.changes/next-release/api-change-appsync-84246.json

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+{
+  "type": "api-change",
+  "category": "``appsync``",
+  "description": "Adds new logging levels (INFO and DEBUG) for additional log output control"
+}

.changes/next-release/api-change-bedrockagent-52437.json

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+{
+  "type": "api-change",
+  "category": "``bedrock-agent``",
+  "description": "Add support for user metadata inside PromptVariant."
+}

.changes/next-release/api-change-finspace-24769.json

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+{
+  "type": "api-change",
+  "category": "``finspace``",
+  "description": "Updates Finspace documentation for smaller instances."
+}

.changes/next-release/api-change-fis-48071.json

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+{
+  "type": "api-change",
+  "category": "``fis``",
+  "description": "This release adds safety levers, a new mechanism to stop all running experiments and prevent new experiments from starting."
+}

.changes/next-release/api-change-logs-32102.json

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+{
+  "type": "api-change",
+  "category": "``logs``",
+  "description": "Update to support new APIs for delivery of logs from AWS services."
+}

.changes/next-release/api-change-s3control-28116.json

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+{
+  "type": "api-change",
+  "category": "``s3control``",
+  "description": "Amazon Simple Storage Service /S3 Access Grants / Features : This release launches new Access Grants API - ListCallerAccessGrants."
+}