[PWGLF] LightNucleiTask - Add DCA 3D cuts and SignLoss for Primary (#6272)

* [PWGLF] LightNucleiTask - Set 2D DCA cut and event loss

* [PWGLF] LightNucleiTask - Uniform evloss binning with analysis

* [PWGLF] LightNucleiTask - Add DCA 3D cuts and SignLoss hist for Primary

* [PWGLF] LightNucleiTask - Remove unused histos

Author: giovannimalfattore