Remove NamespaceSourceQuerier API that is no longer in use

NamespaceSourceQuerier API is no longer in use for new resolver so it
should be removed to reduce tech debt and usable code.

Signed-off-by: Vu Dinh <[email protected]>

Author: dinhxuanvu

Diff for: pkg/controller/operators/catalog/operator.go

@@ -891,8 +891,6 @@ func (o *Operator) syncResolvingNamespace(obj interface{}) error {
 	// get the set of sources that should be used for resolution and best-effort get their connections working
 	logger.Debug("resolving sources")
 
-	querier := NewNamespaceSourceQuerier(o.sources.AsClients(o.namespace, namespace))
-
 	logger.Debug("checking if subscriptions need update")
 
 	subs, err := o.listSubscriptions(namespace)
@@ -925,7 +923,7 @@ func (o *Operator) syncResolvingNamespace(obj interface{}) error {
 		subscriptionUpdated = subscriptionUpdated || changedIP
 
 		// record the current state of the desired corresponding CSV in the status. no-op if we don't know the csv yet.
-		sub, changedCSV, err := o.ensureSubscriptionCSVState(logger, sub, querier)
+		sub, changedCSV, err := o.ensureSubscriptionCSVState(logger, sub)
 		if err != nil {
 			logger.Debugf("error recording current state of CSV in status: %v", err)
 			return err
@@ -1092,7 +1090,7 @@ func (o *Operator) ensureSubscriptionInstallPlanState(logger *logrus.Entry, sub
 	return updated, true, nil
 }
 
-func (o *Operator) ensureSubscriptionCSVState(logger *logrus.Entry, sub *v1alpha1.Subscription, querier SourceQuerier) (*v1alpha1.Subscription, bool, error) {
+func (o *Operator) ensureSubscriptionCSVState(logger *logrus.Entry, sub *v1alpha1.Subscription) (*v1alpha1.Subscription, bool, error) {
 	if sub.Status.CurrentCSV == "" {
 		return sub, false, nil
 	}
@@ -1103,10 +1101,6 @@ func (o *Operator) ensureSubscriptionCSVState(logger *logrus.Entry, sub *v1alpha
 		logger.WithError(err).WithField("currentCSV", sub.Status.CurrentCSV).Debug("error fetching csv listed in subscription status")
 		out.Status.State = v1alpha1.SubscriptionStateUpgradePending
 	} else {
-		// Check if an update is available for the current csv
-		if err := querier.Queryable(); err != nil {
-			return nil, false, err
-		}
 		out.Status.State = v1alpha1.SubscriptionStateAtLatest
 		out.Status.InstalledCSV = sub.Status.CurrentCSV
 	}