PerfMonComps: Update the handling of the end of the event loop in PerfMonMTSvc

Alaettin Serhan Meterequested to merge
amete/athena:22.0-ATEAM-872 into master

With this MR, we start using the EndEvtLoop incident, instead of AthMasterSeq:Stop, to signal the end of the event loop if it's ever fired. This should improve the wall-time measurement of the event loop in the MP workflows.

Closes ATEAM-872

cc: @rbielski @tsulaia

Edited by Alaettin Serhan Mete

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