LAfCafJobs: Fix LArReadCells ubsan warnings.

LArReadCells is very large, which results in spurious warnings from ubsan. Fix by changing the large arrays to vectos.

This merge request affects 1 package:

• LArCalorimeter/LArCafJobs

Adding @pavol as watcher

added JetEtmiss LAr master review-pending-level-1 labels

CI Result SUCCESS (hash 72fb26d3)

	Athena	AthSimulation	AnalysisBase	AthGeneration
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 15704]

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 3c479025

added sweep:ignore label