Remove custom metrics test adapter (#590)

Author: astefanutti

Diff for: go.mod

@@ -18,7 +18,6 @@ require (
 	k8s.io/apimachinery v0.26.2
 	k8s.io/apiserver v0.26.2
 	k8s.io/client-go v0.26.2
-	k8s.io/component-base v0.26.2
 	k8s.io/klog/v2 v2.90.1
 	k8s.io/metrics v0.26.2
 	sigs.k8s.io/custom-metrics-apiserver v0.0.0
@@ -106,6 +105,7 @@ require (
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
+	k8s.io/component-base v0.26.2 // indirect
 	k8s.io/kms v0.26.2 // indirect
 	k8s.io/kube-openapi v0.0.0-20230303024457-afdc3dddf62d // indirect
 	k8s.io/utils v0.0.0-20230220204549-a5ecb0141aa5 // indirect