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AthenaMonitoringKernel: fix memory leak on deregistration

Frank Winklmeier requested to merge fwinkl/athena:athmon_memleak into 24.0

The offline THistSvc does not delete objects when calling deReg so we have to delete them manually.

Fixes a memory leak seen in Tile monitoring (https://atlasop.cern.ch/elisa/display/554506). Thanks to @harkusha for finding and reporting this in !74743.

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