Cleanup and refactor all chart widgets

At this point we will have

old DC based chart widgets converted to echarts
old plottable based chart widgets converted to echarts (and renamed EChartChartType)

some remnant code in these above still from how they were used before with DC/plottable and Jeremy’s architecture.

Also, sometimes charts are produced using these wrapper widget components, sometimes using dashboard-child-chart, and sometimes they are produced directly using row-col-chart, etc. We should standardize on an approach.

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