kvserver: always log store rebalancer transfers and relocates

Previously, the store rebalancer would not default log range lease
transfers or replica relocations, nor their estimated load impact. This
made debugging imbalance related issues difficult.

Bump the range relocation and range lease transfer log lines from
`v(1)` to `Info`, so that they are always logged.

Resolves: #107702

Release note: None

pkg/kv/kvserver/store_rebalancer.go

@@ -655,9 +655,8 @@ func (sr *StoreRebalancer) applyRangeRebalance(
 	voterTargets, nonVoterTargets []roachpb.ReplicationTarget,
 ) bool {
 	descBeforeRebalance, _ := candidateReplica.DescAndSpanConfig()
-	log.KvDistribution.VEventf(
+	log.KvDistribution.Infof(
 		ctx,
-		1,
 		"rebalancing r%d (%s load) to better balance load: voters from %v to %v; non-voters from %v to %v",
 		candidateReplica.GetRangeID(),
 		candidateReplica.RangeUsageInfo().Load(),
@@ -800,9 +799,8 @@ func (sr *StoreRebalancer) chooseLeaseToTransfer(
 			continue
 		}
 		if targetStore, ok := rctx.allStoresList.FindStoreByID(candidate.StoreID); ok {
-			log.KvDistribution.VEventf(
+			log.KvDistribution.Infof(
 				ctx,
-				1,
 				"transferring lease for r%d load=%s to store s%d load=%s from local store s%d load=%s",
 				desc.RangeID,
 				candidateReplica.RangeUsageInfo().TransferImpact(),