TrigCost: Include L1Sim in Cost Monitoring

Start the cost monitoring as early as possible (at the begining of hltBeginSeq) to include L1 Sim.

Example:

before https://atlas-trig-cost.web.cern.ch/?dir=aporeba&type=&tag=early-costmon-start-before&run=360026&range=LumiBlock_00150

after https://atlas-trig-cost.web.cern.ch/?dir=aporeba&type=&tag=early-costmon-start-after&run=360026&range=LumiBlock_00150

Related to ATR-25517

Tagging @rbielski @tamartin