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

Simulation/Overlay/OverlayCopyAlgs/src/CopyPixelClusterContainer.h

@@ -23,7 +23,7 @@ private:
   SG::ReadHandleKey<InDet::PixelClusterContainer> m_inputKey{ this, "InputKey", "", "ReadHandleKey for Pileup PixelClusterContainer" };
   SG::WriteHandleKey<InDet::PixelClusterContainer> m_outputKey{ this, "OutputKey", "", "WriteHandleKey for Output PixelClusterContainer" };
 
-  const PixelID* m_idHelper;
+  const PixelID* m_idHelper = nullptr;
 
 };