Update changelog based on model updates

.changes/next-release/api-change-connect-86879.json

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+{
+  "type": "api-change",
+  "category": "``connect``",
+  "description": "GetMetricDataV2 API: Update to include new metrics CONTACTS_RESOLVED_IN_X , AVG_HOLD_TIME_ALL_CONTACTS , AVG_RESOLUTION_TIME , ABANDONMENT_RATE , AGENT_NON_RESPONSE_WITHOUT_CUSTOMER_ABANDONS with added features: Interval Period, TimeZone, Negate MetricFilters, Extended date time range."
+}

.changes/next-release/api-change-location-76867.json

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+{
+  "type": "api-change",
+  "category": "``location``",
+  "description": "Amazon Location Service adds support for bounding polygon queries. Additionally, the GeofenceCount field has been added to the DescribeGeofenceCollection API response."
+}

.changes/next-release/api-change-mediaconvert-5285.json

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+{
+  "type": "api-change",
+  "category": "``mediaconvert``",
+  "description": "This release adds the ability to replace video frames without modifying the audio essence."
+}

.changes/next-release/api-change-oam-56899.json

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+{
+  "type": "api-change",
+  "category": "``oam``",
+  "description": "This release adds support for sharing AWS::ApplicationInsights::Application resources."
+}

.changes/next-release/api-change-sagemaker-13328.json

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+{
+  "type": "api-change",
+  "category": "``sagemaker``",
+  "description": "This release allows users to run Selective Execution in SageMaker Pipelines without SourcePipelineExecutionArn if selected steps do not have any dependent steps."
+}

.changes/next-release/api-change-wellarchitected-14644.json

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+{
+  "type": "api-change",
+  "category": "``wellarchitected``",
+  "description": "AWS Well-Architected now supports Review Templates that allows you to create templates with pre-filled answers for Well-Architected and Custom Lens best practices."
+}