Draft: [trigEGam] Integration beteween mongroups and TrigEgammaMonitoring

This MR is to include mongroups inside the TrigEgammaMonitoring framework.

• A method was implemented in the TrigEgammaMonitCategoryMT reading, for now, the mongoups from JSON local file produced by a ART test.
• At this moment, only the primary chains was configured, and then, called inside the TrigEgammaMonitorConfigMT.py file .
• In a next MR, we will include a logic to route chains to shifter and expert folders automatically, according to their respective mongroups.

JIRA Ticket: ATR-25841 .

ping: @safarzad , @cjmeyer , @fernando , @kyjones and @jlieberm

Generators/GeneratorObjects/GeneratorObjects/McEventDict.h

@@ -11,6 +11,7 @@
 #include "GeneratorObjects/McEventCollection.h"
 #include "GeneratorObjects/HepMcParticleLink.h"
 #include "GeneratorObjects/HijingEventParams.h"
+#include "GeneratorObjects/xAODTruthParticleLink.h"
 #include "RootUtils/PyROOTIteratorFuncs.h"
 
 #include "AtlasHepMC/GenEvent.h"