kvserver: log details about ConditionFailedErrors encountered by sp…

…lits

Informs #87837

Release justification: logging only change

Release note: None

pkg/kv/kvserver/split_queue.go

@@ -167,7 +167,7 @@ func (sq *splitQueue) process(
 		// attempts because splits can race with other descriptor modifications.
 		// On seeing a ConditionFailedError, don't return an error and enqueue
 		// this replica again in case it still needs to be split.
-		log.Infof(ctx, "split saw concurrent descriptor modification; maybe retrying")
+		log.Infof(ctx, "split saw concurrent descriptor modification; maybe retrying; err: %v", err)
 		sq.MaybeAddAsync(ctx, r, sq.store.Clock().NowAsClockTimestamp())
 		return false, nil
 	}