Move TestApplyChangelogFunction to TestIcebergScalarFunctions #25967
Description
We recently added support for the Iceberg bucket() function and added TestIcebergScalarFunctions. changelog() function was implemented some time ago and TestIcebergScalarFunctions needs to be moved to TestIcebergScalarFunctions.
Expected Behavior or Use Case
The tests of Iceberg changelog() function be moved to TestIcebergScalarFunctions
Context
To group related tests together and make code base easy to read and maintain.