Insights: click to turn on/off a line series
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Created by: Joelkw
Needs design.
Motivated by capture groups insights but should apply to all insights.
Provide a way to turn on/off lines on a graph to dig in further.
The y-axis should update to adjust to the remaining lines (so if you remove a big high-count line, the y-axis might shrink to make it easier to see the others).