Fix coordinator balancer 'moved' logs and metrics #6032
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Fixes a cosmetic issue with incorrect 'movedCount' metric and log messaging because the value was sourced from
currentlyMovingSegments.size()rather than the total count of movement operations done, which could be inaccurate if the load finishes before the balancer operation completes and emits metrics and logs.This changes metrics and logs to use the counter value rather than the snapshot of currently moving segments at emit time.