Revert "use sync.WaitGroup in CheckAndRecover()"

This reverts commit 91d3264.

Signed-off-by: Tim Vaillancourt <tim@timvaillancourt.com>

Author: timvaillancourt

go/vt/vtorc/logic/topology_recovery.go

@@ -1141,13 +1141,11 @@ func CheckAndRecover() {
 	rand.Shuffle(len(shardKeys), func(i, j int) {
 		shardKeys[i], shardKeys[j] = shardKeys[j], shardKeys[i]
 	})
-	var wg sync.WaitGroup
 	for _, key := range shardKeys {
-		wg.Go(func() {
+		go func() {
 			recoverShardAnalyses(analysisByShard[key], executeCheckAndRecoverFunction)
-		})
+		}()
 	}
-	wg.Wait()
 }
 
 func postPrsCompletion(topologyRecovery *TopologyRecovery, analysisEntry *inst.DetectionAnalysis, promotedReplica *inst.Instance) {