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HltEventLoopMgr: add option to run algs/sequences during start

Frank Winklmeier requested to merge fwinkl/athena:hltcondalgs into 22.0

Add the execAtStart property that can be used to specify a list of algorithms/sequences that should be executed at the end of the prepareForRun transition. This can e.g. be used to execute all CondAlgs once before the first event to improve memory sharing:

ServiceMgr.HltEventLoopMgr.execAtStart = ['AthCondSeq']

Relates to ATR-26138.

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