Convert UT warnings and errors to accumulators.
Convert warnings and errors in the UT software to Gaudi::Accumulators. Related to Issue Lbcom#11 (closed), which was originally discussed in Lbcom!667 (merged). Related to but does not need to be merged with Boole!514 (merged) and LHCb!4274 (merged).
Edited by Gabriel Matthew Nowak