Signals Notebook: Search filters display both old and new field names after a material field rename

Description

Renaming a field in a material library updates the field label on entity records but the Filters tab may still list the old field name alongside the new one, causing duplicate filter options. 

When a field is renamed, existing entities retain their metadata under the original field name. Only entities that are newly created or updated after the rename will reflect the new field name. So, it is expected that search filter is displaying both the old and new column names, as the underlying data for older entities still references the original name.