The spreadsheet pivot side panel no longer uses a separate Odoo-specific highlighting behavior. Highlighting is now handled consistently by the shared spreadsheet engine for all pivot types, reducing duplicate logic and improving consistency.

This removes the code creating highlights for odoo pivot in the side panel. It is now handled in o-spreadsheet directly for all pivot types.

Task: 4341467

The spreadsheet pivot side panel no longer uses a separate Odoo-specific highlight behavior. Highlighting is now handled centrally in the spreadsheet engine for all pivot types, making behavior more consistent and reducing duplicate maintenance.

This removes the code creating highlights for odoo pivot in the side panel. It is now handled in o-spreadsheet directly for all pivot types.

Task: [4341467](https://www.odoo.com/web#id=4341467&cids=1&menu_id=4720&action=333&active_id=2328&model=project.task&view_type=form)