Aims to make minimal changes to `DrawableSlider` itself. I'm not super
happy about the slider ball being moved above the head circle, but it
*is* what people are used to so no one except for me is going to
complain.
Supersedes and closes https://github.com/ppy/osu/pull/14561.
The same tooltip can be used for the rank graph, the play history graph,
and the replay history graph.
The only difference between those three is the displayed label, which
has now been included as part of the `TooltipContent`, rather than
unnecessarily recreating tooltips just for different sprite texts.