[FIX] charts: fix zoomable scatter chart

[hokolomopo]

Description:

[FIX] charts: fix zoomable scatter chart

The zoomable scatter chart would display a line chart in the "master",
instead of a smaller scatter chart.

[IMP] tests: add zoomable chart plugin tests

The chart runtime generated for the "master" chart of zoomable
charts was actually never properly tested, except indirectly
through unrelated snapshot tests.

[MOV] tests: move zoomable chart tests to a dedicated folder

Task: 5143146

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]