kvserver: omit unnecessary campaign checks on leader unquiescence

This patch changes a couple of `maybeUnquiesce()` call sites to not
attempt to campaign when we know the replica must already be the leader.

Epic: none
Release note: None

pkg/kv/kvserver/replica_raft_quiesce.go

@@ -470,7 +470,7 @@ func (r *Replica) quiesceAndNotifyRaftMuLockedReplicaMuLocked(
 			if log.V(4) {
 				log.Infof(ctx, "failed to quiesce: cannot find to replica (%d)", id)
 			}
-			r.maybeUnquiesceLocked(false /* wakeLeader */, true /* mayCampaign */)
+			r.maybeUnquiesceLocked(false /* wakeLeader */, false /* mayCampaign */) // already leader
 			return false
 		}
 

pkg/kv/kvserver/store_raft.go

@@ -705,7 +705,7 @@ func (s *Store) nodeIsLiveCallback(l livenesspb.Liveness) {
 		lagging := r.mu.laggingFollowersOnQuiesce
 		r.mu.RUnlock()
 		if quiescent && lagging.MemberStale(l) {
-			r.maybeUnquiesce(false /* wakeLeader */, true /* mayCampaign */)
+			r.maybeUnquiesce(false /* wakeLeader */, false /* mayCampaign */) // already leader
 		}
 	})
 }