Add changelog for 7725

Author: jenshnielsen

docs/changes/newsfragments/7725.improved

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+Parameters using ``has_control_of`` are now correctly handled when exporting to
+xarray. Controlled parameters are no longer treated as independent top-level
+parameters, preventing duplicate data rows. Additionally, inferred parameters
+are now included as data variables in the xarray dataset when exporting via the
+pandas-based path, and a warning is logged when the inferred parameter data size
+does not match its parent parameter.