K8s: use runtime config for API Builders (#114601)

* Reapply "K8s: read resource configs from API Enablement for API Builders" (#114475)

This reverts commit 4130bd9cd3.

* revert part that broke things

* FF service changes are gonna come later

pkg/services/apiserver/builder/request_handler.go

@@ -6,7 +6,9 @@ import (
 
 	"github.com/gorilla/mux"
 	"github.com/prometheus/client_golang/prometheus"
+	serverstorage "k8s.io/apiserver/pkg/server/storage"
 	restclient "k8s.io/client-go/rest"
+	klog "k8s.io/klog/v2"
 	"k8s.io/kube-openapi/pkg/spec3"
 )
 
@@ -14,7 +16,7 @@ type requestHandler struct {
 	router *mux.Router
 }
 
-func GetCustomRoutesHandler(delegateHandler http.Handler, restConfig *restclient.Config, builders []APIGroupBuilder, metricsRegistry prometheus.Registerer) (http.Handler, error) {
+func GetCustomRoutesHandler(delegateHandler http.Handler, restConfig *restclient.Config, builders []APIGroupBuilder, metricsRegistry prometheus.Registerer, apiResourceConfig *serverstorage.ResourceConfig) (http.Handler, error) {
 	useful := false // only true if any routes exist anywhere
 	router := mux.NewRouter()
 
@@ -27,6 +29,12 @@ func GetCustomRoutesHandler(delegateHandler http.Handler, restConfig *restclient
 		}
 
 		for _, gv := range GetGroupVersions(builder) {
+			// filter out api groups that are disabled in APIEnablementOptions
+			gvr := gv.WithResource("")
+			if apiResourceConfig != nil && !apiResourceConfig.ResourceEnabled(gvr) {
+				klog.InfoS("Skipping custom route handler for disabled group version", "gv", gv.String())
+				continue
+			}
 			routes := provider.GetAPIRoutes(gv)
 			if routes == nil {
 				continue