The spreadsheet pivot details side panel has been adjusted to better handle overflowing content. This should make detailed pivot information easier to view and reduce layout issues for users working with spreadsheets.

Spreadsheet filter side panels now use the shared side panel component from the spreadsheet engine instead of a separate Odoo-specific version. This keeps the experience visually consistent while reducing duplicated maintenance work.

After the revamping of the side panels, the component `SidePanelCollapsible` of o-spreadsheet now have the same style as the one we have in Odoo.

We can remove the odoo's implementation and use the one from o-spreadsheet.

Task: [4105418](https://www.odoo.com/web#id=4105418&cids=1&menu_id=4720&action=333&active_id=2328&model=project.task&view_type=form)