Update changelog based on model updates

.changes/next-release/api-change-connect-75963.json

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+{
+  "type": "api-change",
+  "category": "``connect``",
+  "description": "This release adds new fields SignInUrl, UserArn, and UserId to GetFederationToken response payload."
+}

.changes/next-release/api-change-connectcases-98102.json

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+{
+  "type": "api-change",
+  "category": "``connectcases``",
+  "description": "This release adds the ability to disable templates through the UpdateTemplate API. Disabling templates prevents customers from creating cases using the template. For more information see https://docs.aws.amazon.com/cases/latest/APIReference/Welcome.html"
+}

.changes/next-release/api-change-ec2-87651.json

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+{
+  "type": "api-change",
+  "category": "``ec2``",
+  "description": "Amazon EC2 Trn1 instances, powered by AWS Trainium chips, are purpose built for high-performance deep learning training. u-24tb1.112xlarge and u-18tb1.112xlarge High Memory instances are purpose-built to run large in-memory databases."
+}

.changes/next-release/api-change-endpointrules-12327.json

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

.changes/next-release/api-change-groundstation-51448.json

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+{
+  "type": "api-change",
+  "category": "``groundstation``",
+  "description": "This release adds the preview of customer-provided ephemeris support for AWS Ground Station, allowing space vehicle owners to provide their own position and trajectory information for a satellite."
+}

.changes/next-release/api-change-mediapackagevod-88266.json

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+{
+  "type": "api-change",
+  "category": "``mediapackage-vod``",
+  "description": "This release adds \"IncludeIframeOnlyStream\" for Dash endpoints."
+}