Add changelog entries from botocore

Author: aws-sdk-python-automation

.changes/next-release/api-change-amplifybackend-6992.json

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+{
+  "category": "``amplifybackend``", 
+  "type": "api-change", 
+  "description": "[``botocore``] Imports an existing backend authentication resource."
+}

.changes/next-release/api-change-proton-33548.json

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+{
+  "category": "``proton``", 
+  "type": "api-change", 
+  "description": "[``botocore``] Added waiters for template registration, service operations, and environment deployments."
+}

.changes/next-release/api-change-snowball-82729.json

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+{
+  "category": "``snowball``", 
+  "type": "api-change", 
+  "description": "[``botocore``] AWS Snow Family customers can remotely monitor and operate their connected AWS Snowcone devices. AWS Snowball Edge Storage Optimized customers can now import and export their data using NFS."
+}