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

Control/AthenaKernel/src/DsoDb.cxx

@@ -328,10 +328,8 @@ DsoDb::build_repository()
     if (!boost::filesystem::exists(*itr)) {
       continue;
     }
-    Paths_t dir_content;
-    std::copy(fs::directory_iterator(p), 
-              fs::directory_iterator(), 
-              std::back_inserter(dir_content));
+    Paths_t dir_content {fs::directory_iterator(p),
+                         fs::directory_iterator()};
     std::sort(dir_content.begin(),
               dir_content.end());
     for (Paths_t::iterator ipath = dir_content.begin(),