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

PhysicsAnalysis/ElectronPhotonID/EGammaVariableCorrection/CMakeLists.txt

-# Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
+# Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
 
 # Declare the package name:
 atlas_subdir( EGammaVariableCorrection )
 
 # External dependencies:
-find_package( ROOT COMPONENTS Core MathCore Hist Graph RIO )
+find_package( ROOT COMPONENTS Core MathCore Hist Graf RIO )
 find_package( Boost COMPONENTS thread )
 
 # Component(s) in the package: