Add ChangeLog for public surface cleanup (#43152)

* Clean up public surface since list GA

* Fixed return types

* Remove unused imports

* Remove List type

* Add CHANGELOG for public surface cleanup

* Updated changelog

Author: allenkim0129

sdk/cosmos/azure-cosmos/CHANGELOG.md

@@ -10,6 +10,7 @@
 
 #### Other Changes
 * Removed dual endpoint tracking from the sdk. See [PR 40451](https://github.com/Azure/azure-sdk-for-python/pull/40451).
+* Reverted typehints to fix the mismatch issue. See [PR 43124](https://github.com/Azure/azure-sdk-for-python/pull/43124)
 
 ### 4.14.0b4 (2025-09-11)