[IMP] Charts: keep and disable useless dataseries for pyramid chart

[anhe-odoo]

Task Description

Currently, when creating a pyramid chart with more than two data series, we are removing the unused ones, which lead to a loss of data series when switching back to another chart type.

This PR aims to change this behavior, by keeping all the data series but keeping only the first two in the runtime, and showing the redondant series as disabled in the config panel.

Related Task

• Task: 4570622

review checklist

• [ ] feature is organized in plugin, or UI components
• [ ] support of duplicate sheet (deep copy)
• [ ] in model/core: ranges are Range object, and can be adapted (adaptRanges)
• [ ] in model/UI: ranges are strings (to show the user)
• [ ] undo-able commands (uses this.history.update)
• [ ] multiuser-able commands (has inverse commands and transformations where needed)
• [ ] new/updated/removed commands are documented
• [ ] exportable in excel
• [ ] translations (_t("qmsdf %s", abc))
• [ ] unit tested
• [ ] clean commented code
• [ ] track breaking changes
• [ ] doc is rebuild (npm run doc)
• [ ] status is correct in Odoo

[robodoo]