Chart items on the dashboard are no longer links
A long time ago the segments in the charts were clickable. For example in the Host Configuration Chart for Puppet you can have x% in out of sync. That used to be clickable and take you to the search to show those hosts. The table with the same data still has clickable links.
Fixes #24351 - chart click through search
Fixes long lasting regression of charts on dashboard not being clickable through.
Adds posibility to specify custom filters for chart segments.
Moves click handler from DonutChartService to ChartService, as there is no reason for
this funcionality not to be added to more chart types in the future.