Draft: Fix a problem with Sequencer incident handling in ES MT

Closed Marcin Jerzy Nowak requested to merge mnowak/athena:sequencer.fix.ESMT into master

Sequencer will no longer overwrite the slot0 rangeID when given the NextRange incident without event context, but rather it will store the new rangeID for the next BeginProcessing incident. That should fix EventService MT. No behavior changes should be observed when not using ESMT. FI @tsulaia

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