* New option to show/hide stacked plot aggregate legend - defaulted to not show.
Use the Plot component in the StackedPlotItem component for simplicity and show/hide sub-legends as needed.
* Fix position and expanded classes when children are showing their legends
* Fix broken tests and ensure gridlines and cursorguides work.
* Adds e2e test for new legend configuration for stacked plot
* Address review comments - Remove commented out code, optimize property lookup, fix bug with staleness
* Remove the isStale icon in the legend when a plot is inside a stacked plot.
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Co-authored-by: Jamie V <jamie.j.vigliotta@nasa.gov>
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