ZFP: Delete option for ellipse and arrow annotation should be available on right click menu

Currently in ZFP users can apply measurements, text annotations, and ROI's and can right click on the measurement and delete them. However, for the arrow and ellipse, this option does not exist. Users have to use the series menu to delete. Discussed with L4 team and they think this is design (not defect). Therefore raising as a FR because the delete option should be available and consistent throughout the ZFP toolset.