TrigCost: Fix Walltime histogram

• Fix the Walltime histogram to collect more than 1000 lumiblocks - the maximum value is set to 4500 now, that was a maximum during the longest run last year. It was tested with a 2023 recent run and an entry at lumiblock 1234 is present as well as denominator in the post processing:

RunTrigCostAnalysis.py --skipEvents=45000 --maxEvents=1 Input.Files='["/eos/atlas/atlastier0/rucio/data23_13p6TeV/calibration_CostMonitoring/00454322/data23_13p6TeV.00454322.calibration_CostMonitoring.daq.RAW/data23_13p6TeV.00454322.calibration_CostMonitoring.daq.RAW._lb0000._SFO-20._0023.data"]'> CostAnalysis.log 2>&1

• The deadtime item is chosen based on the run number - for runs after the change of physics deadtime item https://gitlab.cern.ch/atlas-tdaq-oks/p1/tdaq-10-00-00/-/commit/31c7c6e6b9f3c796c97cf4a61e76818d7da410df , L1_eEM26M--enabled will be used
• Append maximum pileup instead of mean to the cost details

Tagging @tamartin