Draft: Including mongroups mechanism in the TrigEgammaMonitoring
This MR is to include the mongroups mechanism in the TrigEgammaMonitoring. Chains are retrieved from menu are being imported in the monitoring configuration for electron and photon monitoring algorithms. Discussions in the JIRA ticket: ATR-25841 .
ping: @safarzad , @fernando , @jodafons , @ebergeas and @cmerlass .