Add tool-tip/other mouse-hover functionality to Everest Plots

[eilskra]

We should add tool-tip/other mouse-hover functionality to objective function, total batch objective and gradient plot, so we can isolate bars and realizations. #13463 (comment)

[eilskra]

Solution: #13463 (comment)

We should consider removing the extended plot information-button from the total batch objective plot, but we might as well keep it as its opt in and it displays batch info for all the points