[CARRY] downstream_csv_namespace_labeler: use shared informers

Consume the informers that the host operator exposes in order to reduce
resource consumption. A more straightforward approach would have been to
share the shared informer factory itself, but that would have been more
involved.

Signed-off-by: Steve Kuznetsov <[email protected]>

Author: stevekuznetsov

staging/operator-lifecycle-manager/go.mod

@@ -48,6 +48,7 @@ require (
 	k8s.io/code-generator v0.27.2
 	k8s.io/component-base v0.27.2
 	k8s.io/klog v1.0.0
+	k8s.io/klog/v2 v2.90.1
 	k8s.io/kube-aggregator v0.25.3
 	k8s.io/kube-openapi v0.0.0-20230501164219-8b0f38b5fd1f
 	k8s.io/utils v0.0.0-20230220204549-a5ecb0141aa5
@@ -224,7 +225,6 @@ require (
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/cli-runtime v0.27.2 // indirect
 	k8s.io/gengo v0.0.0-20220902162205-c0856e24416d // indirect
-	k8s.io/klog/v2 v2.90.1 // indirect
 	k8s.io/kms v0.27.2 // indirect
 	k8s.io/kubectl v0.27.2 // indirect
 	oras.land/oras-go v1.2.3 // indirect