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HltEventLoopMgr: fix race condition during stop

Frank Winklmeier requested to merge fwinkl/athena:hlt_async_stop into main

Deleting the HLT::LoopThread objects is not thread-safe and can lead to race conditions between the main thread deleting them and the callbacks still using them. Also std::unique_ptr::reset is not atomic. Instead of deleting, just wait for the threads to finish. For stop/start transitions, the objects will be replaced during the next call to nextEvent.

This will be cherry-picked into 24.0 after a few days.

Relates to ATR-30102.

cc @ssottoco

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