remove flag LAr.ROD.DoOFCPileupOptimization

Walter Lamplrequested to merge
wlampl/athena:rm_LArRODDoOFCPileupOptimization into master

As discussed in !61299 (merged), the flag LAr.ROD.DoOFCPileupOptimization has the same meaning as LAr.ROD.NumberOfCollisions!=0. This MR removes DoOFCPileupOptimization. All clients rely now on LAr.ROD.NumberOfCollisions

cc @gunal @jchapman

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