* combo stacked chart

* spec

* remove irrelevant spec

* combo stacking

* fix selecting y-axis on stacked charts

* snapshot

* linter, specs, types

* propagate combo stacking to area and bar charts (#42600)

* propagate combo stacking to area and bar charts

* enable combo stacking for bar/area charts, fix data transform

* fix types, specs

* fix y-axis extents calculations

* remove spec that tested the removed control, update specs, update test data

* review

* show show data values setting on normalized charts that have a line series

* fixes